How high should LED be

A question from a fellow grower:

I recently purchased 2-Excelevan 45w red, blue & white LED. I need to know how high I need to have them above my lil’lady. She’s 2 1/2 months old, 45"x49". Have her on CFL’s now, but need to switch

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I would get them anywhere from 10 to 18 inches from the top A thing I like to do is put my hand right about where the top of your plant is and put the light about a foot above it as long as it does not burn your hand it should not burn your plant. And I would leave your CFL’s in too The more light the better and the closer you can get your lights to the plants the better just make sure it doesn’t burn your hand and it will not burn your plants