I really love my VHO setup and even stony's were growing, but later added a 250w halide. Those were the years that everyone starting to go with all halides and the kelvin spectrum was going crazy, even up to 20. I like the blue tone but that was way too much. My 75 gal. wall reef had around 7,500K total and looked beautiful to our eyes and the corals grew wonderfully. A friend just like the 5,000k or less, which did made it look more like shallow water atolls, almost pure white. I also had a timmer/dimmer controller by Ice Cap, which worked perfectly !
I'll have to see if their still in business ?
For heat escape, I found that a small fan bowing across the top of the water kept the temps down to only 1-2 degrees higher than off, while a halide system needed a chiller.
What kelvin is mostly used today ?