Oceama: Blue Marlin Torch

This is a small diving flashlight with a 6° spot and wide-angle halo, designed for night diving to spot fluorescent underwater life. It operates at 465 nm wavelength, which is claimed to be more effective for fluorescence.

• The description claims that blue light within 450-470nm wavelength range is much more effective in inducing fluorescence compared to UV light.
• The description claims that this flashlight is water-resistant up to 150m with a double O-ring seal.