Think it's rough getting blasted with someone else's high beams? You wouldn't want to find yourself on the wrong side of this totally absurd DIY flashlight. Built by YouTuber rctestflight, and comprised of ten separate 100-watt LEDs all mounted on a giant heatsink for one serious light show.

The ten-pound rig is powered by two 8 amp-hour lithium-polymer batteries (roughly the battery power of 9 iPhones 6S batteries) and can run for about 10 minutes, though since it only has passive cooling, it gets relatively hot after only a couple of minutes. As for output, rctestflight figures it puts out around 90,000 lumens, a measure of visible light emission. Of course there's more to a good flashlight than just brute-force lumen power, but even the beefiest Maglites top out at around 700.

So how does 90,000 lumens look? See for yourself:

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