That's because Popular Science recently published step-by-step instructions on how to create your very own flashlight that runs on dead batteries.

Last year, we saw perhaps the brightest flashlight ever made, a DIY 1000W beast composed of ten different lights which can throw out a combined 90,000 lumens. How do you improve on that? You make ...

If you’re a flashlight person, you know that there’s little you would do to get the brightest, most powerful, most ridiculous flashlight possible. You might even decide to build yoursel… ...

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?