I have 400w MHs running 6500k Iwasaki bulbs. 3 are currently over my 200gal reef.
I have two PFO tar ballasts that are very reliable and economical that I would recomend to anyone, that I have never had any probs with.
I also have 1 electronic ballast from <a href="http://www.championlighting.com" target="_blank">www.championlighting.com</a> for the middle MH lamp. I have noticed ZERO difference in output or color.
The only thing I like about the Blueline Electronic ballast is that it runs cooler than the tar ballasts. By how much, i can't say, but the tar bal. are too hot to touch, the E-bal. is not. Anyway, if you are on a budget, get the tar bal.
The only other difference about the E-ballast is that you can run ANY color temp bulb - provided it is the same wattage.
Hope that helps some.
