I didn’t mean he should run 315 CMH bulbs in his units
I was just saying about how good they r , and if we are talking saving power they are the way to go. But you need the right ballasts to run them.
This is what I’m using , one has a China bulb the other I got the Phillips
To early to tell if the Phillips is (as) better as said. Definitely has higher Kelvin looking spectrum (to my eye) vs the Chinese bulb,
Both are around 4000k
http://www.tthydroponic.com/index.php?route=product/product&path=182&product_id=1054