Grow light switch and duration


Hi new medical grower here. My first question is after putting the seeds in the soil. How long or how many weeks should I keep the metal halide bulb on before I switch to the HPS bulb?

Thank you


Metal Halide is commonly used during the vegetative photo period. You use this for the entire veg’ cycle. For full maturity toy veg’ for 8 weeks, then change to HPS. From clone; You can change anywhere from 3 weeks to 8 weeks, depending on grow space.

HPS lamp is used for flower cycle. 12/12, inducing the plant to present sex, and flower.


Thank you… It is greatly appreciated.


No worries. Peace