ok thanks for that.....do I need to worry about backscatter with video lights as well? Im thinking I prob do.....
Certainly. To get around backscatter, position the lights backwards, i.e. let the lights level with your housing tray handles. You want to avoid having the lights emit intensely close to the camera port/field of view.
In addition, the idea of pushing the lights outwards, whether for wideangle shooting or other scenes, is to spread the lights beam and to have the soft spot of the light (the edge of the light cone) illuminate the subject instead of the hot spot (the center of the light) which reflects backscatter significantly.
Once again, these are general guidance and it all depends on your subject, distance and background. If let say you are shooting a subject with rocks or corals as background, backscatter will not be a serious issue as shooting the subject with a contrasting background color, the water for example.
Shoot, assess and adjust until you get it perfect is the way to go really.