Sounds like it would work. One thing i recommend is putting your lights on seperate ballasts and wiring in a plug for each. If you have an actinic and a 10000k bulb, for example, you could put each bulb on a timer and plug them both in so that your 10000k bulb turns off first, then your actinic. This way your actinic will produce a dusk effect and cause less stress on your fish than just turning off both lights at the same time.
I'm not sure if VHO gets hotter than PC. Anyway you can find to elevate the fixture off the top glass, the better. Like I said, I kept baking the salt onto my glass from my hot lights being right at the glass. My glass is now etched and won't come completely clean.
My retrofit kits haven't shown up yet but I'll post some pics as I go. I'm going to leave the moon LED's on all the time and not put them on a timer. They don't use much electricity and won't burn out so why turn them off?
At night my led's look like little spot lights shining through the haze of the water. It looks cool. Kind of like my fish are at a Pink Floyd concert.:joy: