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    600w HPS height above plants?

    So... I have 6 "tomato" plants growing under my 600w hps. Some of the leaf tips were starting to burn which suggests my light is to close. It was about 13" from the top of the closest cola. Question is: How far should the light be away? Also, I have 1x 2300k 300w CFL & 3x 5600k 100w CFL...
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