we use either 10w or 18w Dive Rite HID lights to shoot commercial video
(primarily cave work). No problems with the lights at all (we have a
total of eight between four people and not one has flooded). We have
found a slight diffuser spreads the light a bit better.
The same lights are then used as a primary dive light.
You do NOT want a 50w HID!!! (think Hollywood movie premiere
spotlights). A 10w works fine and can do both jobs you want most likely.
Some makes do have wet connects to switch heads even underwater but we
decided the additional cost and added failure point were not worth it.
> I'd like to replace my current halogen u/w video lights with HID lights. My
> preference is for a canister HID light setup that I can use for both
> shooting u/w video and also for general dive lighting when not shooting
> video (in other words the lamp heads can be detached from the arms). Also,
> what size HID wattage is most versatile as an u/w video light and also as a
> general dive light? Not sure but are the bulb wattages interchangable? If
> so could I use a 18w while shooting a video and then a 50w on a night dive
> when I didn't want to shoot video but wanted to light up the reef?
> Any and all recommendations appreciated.