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.
MEER: 7 Redenen om over te schakelen van HPS naar LED -kweeklichten binnen 2023



