Just wanted everyone to share their experiences with all the different bulbs they are using/have used.
I've used the old style CV10k,new style CV10k,XM10k,and am currently using Iwasaki 6.5k all of the 250w mogul variety.The first release of the CV10k was the best looking.brightest 10k bulb i've seen.Too bad it had higher UVB levels than most bulbs and it fried alot of corals.The new-style CV10k had a very nice color that was close to a 12-14k on my IC ballast but it didn't have as much PAR as the old.The XM10k i only got to use for a few days before my old-style icecap quit firing it.I found it to be rather yellowish for a 10k.The Iwasaki i'm using is very bright but it also has the same yellowish tint.Blues and yellow show up well with this bulb but purple and greens are kinda washed out.
My next bulb I'll be using is the new CoralVue reeflux10k that tested well in Sanjays spectral analysis tests.I got to see it on a friends tank and was impressed.I like the fact that it has a spectral peak@450nm(same as radiums)where as most 10k's peak@420