I'm not trying to be combative either, I just want to know what will work the best. I just got off the phone with a guy from the electrical supply house I bought my MH ballast from. I asked if he also sold the MV ballast, and he said he could get it, but that the electrical industry was moving away from both the MV and High pressure sodium types of ballasts. I plan to stay with the MH ballast for my application. What I will do is investigate the PFO "EYE" ballasts. I believe you that you're running the Iwasaki's on MV ballasts, and wish you the best. I am curious if you have seen the Iwasaki's run on both types of ballasts, and if you can actually see a difference? Or measure it with a light meter? Let me know. What wattage are you using?
Although I have a fish only tank now, I am still in the planning stages for my reef tank. I am taking a long time to do it, but hope my patience will pay off with a very successful reef. I have been buying parts along for the past year, and one thing I have is the ballast and lamp setup.
My point all along has been that it is unwise to go to HD or Lowes and buy a streetlamp and try to put it over an aquarium. That is what I tried years ago, and it did not work. It always looked green with the lamp that came with it, and it would not run the coralife bulb I tried. I would also be wary of buying the HO ballast for running a VHO tube that is shorter. I don't doubt that you could run the lamp, but without the right kind of equipment to test the spectrum, I would not trust my tank to it. A good Icecap VHO ballast will last a long time. You'll save some money now, but will it be lost with the high cost of replacing bulbs over time???? It's hard to know who to believe about the life of bulbs, because the people who sell them would obviously like to sell more of them. For VHO, I have understood it should be 12-18 months if you have the Icecap, and 6-8 months with a magnetic type. The Icecap is also supposed to run much cooler. MH's should be replaced every 12-18 months.
Thanks,
Sonny