Tigershark
underwater torches
Perfect compromise between power and size.
850 Lumens delivered by CREE LED XM-L2 and more than 2 hours of runtime during inmersion and almost 3 hours during surface use. No rival in balance between power and runtime on mono-LED flashlights. Uses 2 18650 Li-Ion batteries.
It's light power is similar to much bigger flashlights with 50% more runtime in a reduced size.
Features a heat protection to avoid malfunction or safety problems during the surface use, so it reduces light power to achieve safer body temperatures.