Lamp Wattage and Distance Grow Lights

The wattage of your lamp dictates the distance from plants. Lamps that are 150W are not very hot and can be placed within 6-8" of your plants, while 600W lamps need to be kept at a distance of 18-24".

My young naranjilla (Solanum quitoense) transplants, and Brugmansia cuttings, are growing about 6-8” below a 4-lamp T5 fluorescent fixture. As they get taller, they’ll need to be moved further away from the lamps or their foliage will burn.

Gardening Under Lights Book