I know that poorly shielded lamp cords on the early blue blue and silver Lumatek's were an issue on the 600w's (before 1kw's were introduced), prior to the "internally shielded" feature on later blue & purple versions (which have unshielded lamp cords). But as of about the release time of the Lumatek 1kw's (which were also similarly "internally shielded"), I recall there still being a 1kw-specific issue with RF/EMI. Something about a 10' interference radius with certain frequencies such as AM radio, and possibly also cable. I've read stories of folks who have gotten their cable service shut off because too much noise was being generated from their house, shortly after installing digital 1kw's.
(I used to maintain a digital ballast RF/EMI status thread here, where lots of folks reported back their results with many brands, models, and revisions of digital ballasts.)
I looked into the Quantum 1kw's a bit and saw the "complies with section N of FCC ...", but wasn't sure what that really meant in the real world. I suppose with many folks using 'em w/o problems nowadays it shouldn't be an issue, and I will take your word for it that it's now been addressed. But I don't have any hands-on comfort with that yet in very dense urban settings that I'm used to, and I guess that combination is why I'd be hesitant to spend an extra $1k+ when installing a room.
$260 isn't too bad... is that an out-the-door price or pre-tax? Hydrofarm XtraSun's cost me $130 out the door.
I'll definitely check out the Ushio bulbs; thanks for the tip.
No problem mate, yeah that was pretax, got em from a local shop and they give me a 20% discount off their already really good prices. I can't believe how many shops charge full retail for stuff!