How far should 400w HPS grow lights be from cannabis?

I have a 400w HPS grow light and I don’t know how high it should be hung above my cannabis plants.

You shouldn’t put HPS grow lights above your plants by more than 30 inches (76 cm). Medium-sized lights like 600w’s can be placed about 25″ (64cm) above the plants without losing vigor, while smaller 400w lights can only be placed about 20″ (~51cm) away from the plants.

MORE: 7 Reasons To Switch From HPS To LED Grow Lights In 2023



What Others Are Asking

Read Detailed Advice From Blog Articles

Scroll to Top
Scroll to Top