Well, if you're going to hook it up to an HQI ballast, I have to say the XM 10k. You're not going to find a better PAR/growth/color combination. Iwasaki is right up there, but a little on the yellow side. If you want blue, Radium 20k is the only way to go (but it will only last about 6 months). I've seen a lot of bulbs in person, and my XM 10k is by far the most intense and has the best growth besides the Iwasaki 6500k. G-man megachrome SUCKS. The color sucks and they're not worth the money.
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2001 black T/A WS6~M6 ASC#6979
331rwhp/348rwtq
Mods: !CAGS, Pro 5.0, TSP lid, BGRA, Raptor shift light, Strange 4.10 gears, GMMG exhaust
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