If you’re using new bulbs, by no means start closer than the “~Sunlight” distance on the chart and only move lights closer if your plants are stretching in the direction of the light (getting tall and lanky). This grower didn’t keep moving the 600W HPS mild up as crops obtained taller, and a few colas on the left plant received inside 12″ (30 cm) of the bulb. As a end result, the highest buds and leaves on that plant got burnt and/or bleached. Though grow lights have been an environment friendly device for growing fruits and veggies indoors, observe this will not be a great choice for some crops. Squash, peas, beans, melons, cucumbers, corn or watermelons may not survive the artificial rising course of indoors.