Both the BW-1 and FL-1 dive lights are great tools for finding coral recruits and juveniles during either day or night dives. Depending on how you plan to work you might favor one over the other for your particular application.
First the simple background:
Both the BW-1 and FL-1 have two LEDs that are selected by turning the power switch either to the left or the right. The difference between the two lights is this:
If you are not going to be night diving the FL-1 is probably the better choice since you can use it in flashing mode underwater or at your wet tables during the day, and in steady mode when working in the lab. Sometimes even during the day it is nice to have the steady mode at hand for a closer look after you have found a subject with the flashing mode. If you are going to be working predominantly at night then the BW-1 is probably the better choice since you can leave the blue LED in steady mode and have the white LED always immediately available.
If you need any additional assistance in making a selection please contact NIGHTSEA.