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I guess LEDs are out of question. I thought it was going to make my life easier, but thanks to @Rocket Soul and his infrared thermometer + VPD, I will leave it to Beaver. "The transpiration rate of the plant is driven by changes in vapor pressure deficit (VPD), which is a combined function of...

Thanks for all the replies. You guys are all legends. Peace.

Trying to keep it simple. I'm going with 4x kingbrite qb132. I will source 185 driver locally. Also will make the frame myself. What spectrum should I go for? With epistar red, or add in later as supplement? Lm301b or *h? Anyone against this light?

I suffer from analysis paralysis. So thought: just get a qb120; hang it in a small closet with a plant; give it water. And pray.

European

How small of a grow room? How many plants? How many watts? Chinese Qb? Etc...