The Ice Cap 400W Electronic is a fairly new ballast, from what I've read on Reef Central some people were having problems with them, main one was bulb flickering, I don't know if they have all the bugs ironed out.
The only distributor of the Blueline Electronic Ballast is Champion Lighting in the U.S., I got mine from Tim at Seacare, he had ordered a number of them, not sure if he has any left.
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