Why Use a Single Strobe?Obviously one strobe is less expensive than two, but there are other reasons that using a single strobe might actually be preferable.Hydrodynamic resistance. A second strobe provides more water resistance and can be awkward when swimming against the current. Likewise, a second strobe makes the system bigger and more ungainly. In restricted spaces like shipwrecks or tight coral crevices this can be a problem.Turbid water. Using two strobes increases the potential of backscatter on both sides of the frame rather than just one.Lighting wide angle. Here there are two schools of thought. One says that wide-angle photography should be done with twin powerful strobes mounted on long articulated arms so that reef scenics can be evenly lit across a single plane, or perhaps one strobe might be directed to a colorful foreground while the second would illuminate a nearby model.I prefer to use a single powerful strobe for wide angle. For me, this system is quicker, more ergo

.Brightness : When it comes to underwater lights, the general rule is the brighter the better. This is particularly true in night diving, when a bright light with a wide beam, Beam angle : Depending on what kind of diving you do, a tight beam or a wide flood may each be appropriate. A tight bright spot is useful for spotting, for looking into crevices and under ledges, and a must for limited visibility diving in murky water. A tight beam with no spill will cut through the murkiness and allow you to see further, when a wide beamed light would reflect back from the particulate and make it more difficult for you to see. Tech divers tend to prefer narrow beam lights because they allow you to see further down long passages or into wrecks.