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This flashlight claims to output 1.3 million lumens.

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And this, this is my new gaming monitor.

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Hmm, jealous? Don't be.

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This monitor only works for a few minutes at a time,

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would likely damage your eyes if it worked any longer than that.

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And because of its backlight here, it carries a non-zero risk of burning your house down.

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The things we do for science are not just for science.

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You see, the latest trend in display manufacturing is towards brighter and brighter monitors and TVs.

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But just like the previous fads, like making them thinner and pumping up the resolution,

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there's a point where more is not necessarily better.

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And what better way to demonstrate this than to reach that point and keep on sailing.

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We started out with a regular old gaming monitor and turned it into the brightest one the world has ever seen.

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We expected to have a lot of fun. And we did.

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But what we didn't expect was the discoveries we made along the way.

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So let's begin our journey to Luminosity

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by very carefully tearing down an LCD monitor.

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Right after this segue, to our sponsor.

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Okay, that's a joke. It was already cut in half.

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The point is that inside a modern LCD display,

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there's a lot going on. But for our purposes,

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we only need to understand four main parts today. Starting with what sits closest to us,

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the liquid crystals, the LCs of our LCD.

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These sit sandwiched between two polarizing filters

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that are configured to prevent any light from passing through. You can actually see the same principle at work

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with a variable ND filter like this one for a camera.

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In this configuration, we can see through it just fine.

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And in this one, it blocks pretty much all the light

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and turns black. So wait, if these are configured

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to keep light from passing through, how does any get through?

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Well, you need a third layer. In between the two polarizers,

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a layer that can control polarization electronically.

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That is your liquid crystals. As voltage gets applied to them,

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they rotate the polarization of light, enabling an image to pass through.

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Things can quickly get more complicated with different types of LCD panels,

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but the same principle applies from an original iPhone

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all the way to a brand new 100 inch LED TV.

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Light passes through the display stack and is filtered by the LCD layer to create the final image.

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But where does that light come from? Well, you've got options.

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On older or cheaper LCDs, there can be a material that is placed

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behind the liquid crystals that's designed to reflect ambient light

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back toward the user. Some of you might remember the struggle

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of trying to catch a streetlight while you played with your Game Boy in the backseat.

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Or you might not know what a Game Boy is and that's totally okay too.

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I'm not old. The point is that more modern displays

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typically remove that reflective layer in favor of a light that is behind the screen.

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But not all back lights are created equal. They've undergone a massive evolution

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from the early days of using bulky, power-hungry fluorescent tubes

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to highly efficient LEDs to, well, this.

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It's glorious, you guys. You've outdone yourselves.

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And it's also really dumb. And frankly, a lot more primitive than modern TVs.

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But it is built using similar principles.

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As you can see here, most modern back lights use LED lights, which makes sense.

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They're small, they're energy efficient, and they're cheap.

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And those LEDs are either distributed along the edges of the display, like this one,

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or more ideally along the entire surface behind the panel.

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Not only does that produce more even luminance, but modern back lights can alter the brightness

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of individual LEDs or at least groups of LEDs

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to selectively dim or brighten parts of the screen

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to achieve the best possible image. Now we're saving our deeper dive into dimming zones

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and backlight control for our next attempt. Next attempt at this.

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Oh yeah! Apparently.

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For now, we're gonna move on to what LEDs we're using today.

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We tested about 10 different varieties with the aim of finding something that balanced cost,

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quality, and size. And we ended up going with the Cree CX-B3590.

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Its compact square shape and high light output made the approximately $28 per unit price pretty attractive.

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There are some compromises, but look at it go!

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My goodness, how is it so flipping bright?

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Well, I'll tell you a secret. This isn't just one LED.

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In fact, if you look much, much closer,

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you can see it's actually an array of over 150 LEDs.

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Cobb LEDs like this one or chip on board LEDs

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simply means that multiple LEDs are mounted to one substrate.

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And while that makes wiring them up dead simple, each one still requires an array's worth of power.

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So that's right, each one of our individual cobs here

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is gonna draw, sorry, is this right? More than five times the original power consumption

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of the monitor? It could draw more if we wanted it.

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Each one of these? Yeah. Huh, how many do we have?

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40! That's like 3,500 watts.

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Ah, I see why there's so many power supplies rigged up to the chassis now.

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And five different breakers.

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We could have bought a single expensive 3,500 watt unit to power everything,

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but we liked the flexibility, not to mention the cost savings of splitting the load

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between 10, 350 watt mean well power supplies.

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We'll have a link to these as well as everything else we used in the video description.

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Now it's time to talk about cooling. Although LEDs are significantly more power efficient

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than incandescent lights, they still waste about half of the power they draw as heat,

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meaning that our new gaming monitor here is gonna throw off something like 1,700 watts

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of thermal energy. That is more than the limit for a residential electric space heater

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here in North America. Thankfully, another advantage of cobs

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is that they're designed to be cooled from the backside.

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Fun fact, by the way, our original plan was to thermal goop

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each of these to a CPU cooler to keep our design time down,

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but then we realized we would need 40 CPU coolers.

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So instead, our resident maker extraordinaire Justin designed this absolutely gorgeous custom water block

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at a aluminum and acrylic that uses our industrial chiller here

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to pump coolant at a chilly 16 degrees Celsius.

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Now the flow path is not optimized, but it does seem to be sufficient for moving heat away

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from the back of our cobs here. What it doesn't do is overcome

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one gigantic design oversight. See, our cobs go back here, right?

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And then our display goes at the front of our shroud here.

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But the thing is that other 1,700 watts of light energy,

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well, it's gonna hit something and turn into thermal energy.

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And when you've got reflective mylar glued all over the inside

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of your 3D printed shroud, it's like a hot pocket

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and not the delicious kind.

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I like to describe it as the easy bake oven from hell. That's why our next iteration added some server fans

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and venting at the cost of some light bleed, but we found out that still wasn't cool enough,

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which is where this box fan came in. Yeah, it's kind of jank, but remember guys,

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this is just a proof of concept for now. What are those doing here?

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The box fan wasn't good enough. And so we have these fans.

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Oh my God. Go to LMG.GG slash Floatplane.

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If you guys wanna hear David and Justin talk a little bit more about what we learned that could help us execute

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on our original idea, which was to build the world's brightest TV.

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One idea they had was to modify the layers of diffusion

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next time rather than just reusing the original ones

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like we did with this one, but enough Dipper Jabber.

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Do I finally get to see it? Yep, it's time.

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They've been working on this in secret. Like I'm only finding out about all this crap now.

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Do we have a fire extinguisher on hand? We, that's what we need.

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Okay, good. They made me do the entire shoot today

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without even being allowed to turn it on yet. Like they showed me the lights,

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but that's why the intro doesn't have the actual monitor on it or anything

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because they're like, oh, Linus isn't allowed to see it until the moment when you can see it.

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Oh yeah, to put on this. Oh.

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Really? Yeah, you need it. Even for one, when we were testing,

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we made sure that we all had welding goggles because one second of exposure

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and you're seeing those lights for the next 20 minutes. 20 minutes?

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It's pretty bad. Is it dangerous? I don't know if it's dangerous.

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It's all fun and games until you get crap or I've burned into your eyes. Yeah.

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Oh my God, even the seepage around it.

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Whoa. This plastic

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is see through.

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Oh, I can see. Yeah, I can see it. I don't know what's wrong with Linus.

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It's so hot. It's getting hot in here.

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Do we have the flare? Can we check how hot they're getting? Yeah, we do have the flare.

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This is flipping crazy, you guys. Is the chiller even on though?

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Oh. Uh, here we go.

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Oh my God. Okay, so hold on, they're at about 19 now.

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Okay. Oh, okay. They're going up 30, 35, 50.

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Oh my God. I can't even see the display once the light is showing.

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Something is smoking. We're gonna have to turn it off. Really? Cause they're not, they're not hot.

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Something's cooking. They're all under 50.

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Every single one of them. Are you sure it's not just flux?

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I'm gonna grab some ISO and wipe it down. Sure. But like none of the wires are getting hot.

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Yeah, it's gotta be flux, you guys. These are, they're not hot. Okay.

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I say we, I say- Let's see how hot we can push it. We go for gold.

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You guys dare me to look into it? They said I don't have any more shoots

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for the rest of the day. So like whatever. It's like what, I need to drive home or what?

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135 degrees Celsius.

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Oh. Is like the max- Dude, dude, we're good.

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Here we go. Here we go, here we go.

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Like my skin is at 38 degrees.

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Like the light turns into thermal energy

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when it hits something, right? So things that it shines at are hot.

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But the LEDs themselves, they're still at about 60 on the hottest ones.

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Okay, it's starting to smoke up real good now. Cut it. Okay, okay.

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Are we gonna put the shroud on? For you, anything.

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Before we do that, how about some speeds and feeds? Like how bright is our backlight

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before we put the LCD in front of it? Well, each CX-B3590 puts out around 12,000 lumens,

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which means we're sitting at just shy of half a million lumens total.

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3.426 lumens is one nit, meaning that our backlight is rated at 140,105 nits.

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For context, the brightest TVs on the market

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are around 10,000 nits. Of course, that's all theoretical.

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We don't have a tool that can measure anything that bright.

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So we're not even gonna try to measure the brightness until we've put our LCD on it.

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And I think this goes this way, huh? The scaler and power supply for the monitor,

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you can see it's just kind of like taped to the bottom of it.

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Can you give me something? Oh, whoa, whoa, whoa, whoa, whoa.

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Yeah, it's out, put it. You okay? It's out, put it, we're good.

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Thank you for that. I should legitimately not be sitting here.

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Whoa, it's the cart gonna move. Oh my God, the cart moves.

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Yeah, that's why we have the commuter backpack here today.

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It's to hold it. Oh my God, okay, yeah, fine.

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I'll talk about it. We put a sandbag in the long-awaited LTT commuter backpack,

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which is available now on LTTstore.com.

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We took the best features of our original LTT backpack,

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and we put them in a smaller, sleeker, more stylish package.

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It's got a reinforced dual-layer bottom, a convenient tech compartment that folds out

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for quick access to your laptop and tablet, and it's built with a durable, water-resistant,

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reprieve canvas that is made of recycled water bottles. It's the backpack that's built

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to support your day every day, and you can grab this fantastic 20-liter bag

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for $149.99 at LTTstore.com.

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I was joking with the guys, like this right here is the difference

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between us and Mr. Who's the Boss.

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Like his biggest iPhone in the world or whatever,

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it was so clean, so sleek, man.

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Love the collab with the IY Perks.

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This is like this peak LTT.

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Okay, here we go. It's my first time getting to, oh my God.

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You guys, it's actually kind of awesome. Yeah.

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Right? I was expecting it to suck.

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It's like direct sunlight is shining off of these rocks.

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Dude, it's actually awesome. Did you know it was gonna be awesome?

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Holy shit. This isn't even HDR content yet.

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Obviously, the LCDs, even in their black state,

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cannot properly block all the light, right?

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So you don't get the same kind of contrast.

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But it's like the sun is the sun. Holy shit.

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All right, we got death. Oh God, turn it up. Oh no, it's dying.

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Did we kill it? Wait, no, it's healing again. It'll be fine.

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We just gotta cut it off before it gets too bad. It'll come back. It's good. That blew my mind.

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I mean, I remember having this conversation. This was with you, Andrew, at CES this year.

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Oh yeah. Remember when we were on the bus? Oh yeah. We were talking about what is the practical limit

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of how many nits we need to have in a display

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for it to really match the real world. And I remember us talking about it

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because we had actually just seen that high-sense TV there

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and we were like, wow, 10,000 nits, that's wild. But then we were watching the light

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glinting off of one of the hotels in Vegas and we were like, that is so much brighter

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than that TV that we just saw. How many nits do you think that was?

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And we were kind of having this conversation. Andrew, I think this is it.

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I think this is the answer. I think we actually need this level of brightness

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to really replicate what it feels like

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to look at the sun reflecting off of something.

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TV manufacturers, I was wrong.

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We are nowhere near the end of the brightness war,

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of the practical benefits of more. Now we, no, no, but we would never want

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to see the entire display at that level of brightness.

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That would be painful. But what we need is outstanding backlight

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and filter layer control so that you can have

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just pinpricks of that level of brightness

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to give you the sparkle and dazzle of light reflecting off of metal

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or off of the peaks of the waves on the water. Like I, okay, did you guys know that this was this awesome?

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We knew it was awesome, but we didn't expect this nice of a reaction.

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Dude, this needs to be a thing.

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I was completely wrong. I thought this was stupid.

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Oh, oh dude, we get to try a game? We're gaming? Yeah, let's play some Alice Week 2.

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Oh my God, see, that's the thing

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is if you're in a dark room and there's a bright light source like that,

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it will dazzle you. Now our content would need to be mastered differently

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to account for this level of brightness being available to it.

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Like otherwise everything's just gonna be blown out and too bright,

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which is kind of what we're looking like in the game. But with it done properly,

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with the dark parts of the scene, as dark as they're supposed to be,

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light sources would be dazzling and it wouldn't be like when the game artificially

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has you walk into a bright space and then you just like see your eyes adjust to it.

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Your actual eyes would adjust to the capabilities of the display.

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And I gotta say, this level of brightness makes the lighting,

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even though the lighting engine didn't change,

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it makes it feel more natural and true to life

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because when you're close to something like that, it is blinding.

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And when it's farther away, it's not.

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Till your eyes, not to the in-game camera.

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That's the difference. They're gonna have to completely change

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the way they handle it. Cause you can see when something is like too close

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and when you go, oh no, it's dying again.

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Wait. Oh my God. Here's what we're gonna do.

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If we had a glass layer and then we ran water through it

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and then we had a glass layer and then we sealed it,

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we could actually have a water tank behind the panel.

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As long as the water is not creating ripples or anything, it's just solid flow.

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It shouldn't as long as there's no bubbles. So maybe we could cool the TV panel that way.

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Oh, chill there. Chill there and the box could work.

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Okay, we've got ideas boys. World's brightest TV, it's going to happen.

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Oh my God, look at it. It's glorious.

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It's like the difference between looking through a window

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and looking at a monitor. Like it shocked me when I watched crab rave

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for the first time, like in that first little scene when they're coming out of the cave into the bright light.

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And like it shocked me. It's like, wow, it's like you're looking out of a cave

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into direct sunlight. Crab rave has no right to look that good.

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No, not at all. I've never tried Counter-Strike with a controller.

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So I have no idea. Oh, you just want me to flashbang myself.

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Oh my God, the sun. Okay, here we go.

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Oh no. Oh!

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Wow, this really is just like looking into direct sunlight.

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It's too much. I need sunglasses.

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Where's my, there's a sunglass pouch in the commuter bag.

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Oh, that's more like it. Oh, no biggie.

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It's just sunny today. That's not a problem with my setup.

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That's just an equipment problem. Scale issue.

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I just need my sunglasses.

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See, no biggie.

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Oh my God. Oh!

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Oh, it's so bright. Oh, there she goes. Oh, she's dying.

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She's dying. Dude, I'm adjusting.

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This looks great. Oh, really? It looks so good.

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We've talked about this in the past, but one of the key elements

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of a display's color capabilities is actually its luminance capabilities.

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That's why we can have monitors today that have 100% coverage of whatever color gamut,

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but they don't look like real life because they don't have enough luminance

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to create the full three-dimensional color volume

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that we can see.

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I unadjusted for a second there and that was pretty rough.

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Ah! Ha, ha, ha, ha, ha, ha.

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Ah, ha, ha, ha. All right, let's do it.

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Let's find out how bright she is.

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It's about 26,000 hits. We did it!

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We made the world's brightest gaming monitor. Ow!

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Oh my God. Great job, guys. Let's go!

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Let's go! The power of the sun in my arms!

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In conclusion, the brightest commercially available monitor

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that we could find was about 5,000 nits,

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and the brightest we've ever measured on a display was an outlier hotspot of 20,000 nits

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on the 110-inch ULED from Hisense.

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We beat them all, and I think we can do even better.

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Anyway, enough of that for now, though. I'm gonna go lie down in a dark room for a bit.

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My eyes are dying, and I'm dying to tell you about our sponsor.

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If you guys want us to make the next version of this, maybe a TV next time, give this video a thumbs up,

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and if you love janky solutions to ridiculous problems, why don't you watch the one where Alex and I

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attach a car turbocharger to a laptop?

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It was somehow more dumb than this, yet brilliant in its own way.