Nightstar Shake LED Flashlight (Black Body, Red LED) Peak Brightness: 10,000 Lux, 940 ft-candles, 8 Lumens Lights up a 10-ft (4m) diameter area at 40-ft (16m) 30 seconds of shaking provides up to 10 - 15 minutes of red light Wavelength: 630 nm Submersible Depth: 2210-ft (674 m)