The led is around 18 / 20 inches far from the plants.... I did not notice any burns on the leaves till now and they do not emit any heat whatsoever. I must say that I was impressed with the lighting.. i did not expect it yo be so bright and heatless...How far the leds away, some people let them grow to the leds rather than keep raising them as they grow, I would go with between 24 - 30 inches. They look really healthy and green, subbed for this one :smoking: