what do you think about the radiion? i saw those on ebay and did a google search for the company and couldn't find a thing on them. i ended up finding someone on there selling 6 bulb hydrofarms for 120.
At first I got the two 4 bulbs for $100 ea. The ebay listing showed them as being used w slight wear. The only sign of any use is subtle dents/marks on the reflector... just windex the reflector when you change the bulbs and they're fine. Ive had no problems at all, and had no prob dropping $150 for the 8 bulb. After I got the first two and then purchased bloom bulbs separately, I found other fixtures being sold with all bloom or 50/50 bloom/6500k... then I found the same fixtures marketed as aquarium lights being sold with blends of 10000k/460actinic. The aquarium models are available new and with optional timers that may allow you to set different on off times for specific bulbs, which may be nice if you want to hit some FarRed/IR before and after the main lights to simulate natural dawn/dusk just like aquarists do when lighting corals.
I think the bad boys are wider overall, my 4 bulbs are 13" wide and the 8 bulb is 17" wide.
I saw the hydrofarms and even searched out commercial lighting mfg's for high bay fixtures, but went with the radiions from ebay again because they have a nice compact design, everything is self contained. 4 bulbs can daisy chain. 8 bulbs cant, but do have multiple switches.
$70 for 4x24" $100 for 4x48" $125 for 6x48" $150 for 8x48" and I think I might have seen some 12 or 16 bulb fixtures... free shipping.