The tiny Princeton Tec Amp packs a 90 lumen LED.
With a large carabiner loop, this handheld light can hang off your gear and is small enough to not get in the way while diving. The Amp comes with a snap on cone to convert your flashlight into a marker light or to provide area lighting. It comes with a built-in bottle opener so you can enjoy a cold one after the dive. The Amp is waterproof  down to 100M.

Specifications