1) From the function of diving :
Not only it suitable to night dive searching as the spot light ,but also can keep that for undersea photography as the flood light . meanwhile ,the red lighting can make fish to stay there at the distance of **0nm.
2)From the specification:
Spot light:*5°on/off 1pcs cree xm-l u2 **0lumen 
Wide beam **0°&**0%**0%**5% 4pcs cree xm-l u2 ***0lumen , it can cover the wide-angle of the Gopro Hero 3/4.
Red lighting **0degree &**0%**0%**5% 2pcs cree XP-E N3
3)From the performance of battery and switch :
Using 1pcs high power ***0lm ****0 with PCB battery ,and the switch has power indicator ,when the battery power is below *0%,the red lighting will show the strobe and remind the diver to return to the land  , and the toggle switch easy to operate