Something else that should be mentioned too...
If you use a 14k or 20k bulb, the PAR will be lower and you can go without the VHO's. 14/20K bulbs in the 400w range have a PAR similar to 250w bulbs in the 10K range.
10K = White
14K = White/Blue
20K = Blue
(The aboves are the norm, but ofcourse they vary with company)
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