If your old incandescent Ryobi flashlight bulb is dead, it's actually possible in most cases to swap it out for an LED.

Okay, I’m obviously sleep-deprived at this point, because this actually looks pretty cool to me. The picture pretty much explains everything: you snap a 9-volt onto this LED attachment, and ta-dah, ...

With a 9-mm flange base that fits almost any two- or three-cell flashlight, the F321-3W 3W LED PR-style flashlight bulb delivers up to 1,200 foot-candles of light. According to the company, the bulb ...