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I have a small grow closet that is about 2'x4'x7'. When I turn on my 400w HPS, it heats up to damn near 100 degrees. On the other hand, when I turn on my 400W MH it temp stays in the mid 80s. The MH is a bit closer to the exhaust, and both ballasts are in the same area. Anyone know what the cause might be? Both are mounted in plain reflectors so thats not it. I don't use both at the same time, but would like to alternate.
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