Does your Olympus have a white balance?
No- In that these are all w/flash, it is irrelevant. I did rig up a piece of curved plastic- like a hood/bounce panel- made from the curve of a bleach bottle. It is rigged to the top of the housing and takes the full illumination of the flash, bouncing it down and flooding the entire area directly in front of the flash.
Since these images, I have since gone to a used Canon G10 and a Canon housing (2 purchases off of eBay) for the video feature. The G10 is last year's model and quite adequate = These are getting very reasonable about now. I still go strictly on-board (built-in) flash but there doesn't seem to be a need to bounce the light downward- it has sufficient coverage in front and down low.
In the old days :doctor: we used flashbulbs, the M5 being quite popular. Compared to any of the best modern available strobes, the M5's were the equivalent to a 1 megaton thermonuclear grenade. But- you needed it- Nikonos cameras loaded with 36 frames of Ektachrome 64 - it was very insensitive to light plus the addition of 3" of macro tubes... it ate a lot of light. You were lucky to get one useable frame on any given dive... maybe. Then- how do you handle the flashbulbs which were buoyant like ping-pong balls.
The G10's added megapixels have been of good use for enlargement, but I still shoot everything in Macro mode with an add-on macro lens "filter". The Canon G10 housing offers a method for attaching the Macro screw-in "filter lens", which is a nice improvement. Buying their screw-in lenses is not a good alternative, they are essentially same things as sold by Porter Camera (Iowa mail order) where they are about 50% off. (Nisha 67mm Macro lens filters)
The same thing applies to the "new big thing"... red filters to color correct for video. Just buy a CC30r (or similar reddish filter) from Porters in the correct filter thread size and you have video color correction at a bargain price. You can likely scrounge and find small ones (50mm) for a few dollars- they were used in B&W photography to increase contrast.
These bigger filters and screw-in lenses, even from Porters, are not cheap- but they are the same exact thing that SCUBA dealers are marketing to you for stupid money.
You can buy the weight system for any camera, but if you duct tape two wheel weights to an "L bracket handle" (another $1 purchase from the junk box at a camera store or check eBay for
L Bracket or similar), it becomes neutral and you have a very useful handle for your housing- add a lanyard.
You don't have to spend a lot of money, you don't have to travel with a lot of heavy, bulky stuff.