Hey this is a black widow clone i bought is my first photo period plant 3 grow how far should the light be away from plant and i whant her to grow atleast 3 feet tall thanks
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Depends on the light. How many watts is it?
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Mars hydro 600
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That is 100 watts so anywhere between 24-30 inches should be good. I have my buds 6 inches away from a 100 watt light right now and they are burning a little. I’m also shining a 300 watt light from the side so that’s not helping. 
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Daam ok i need to raise it a bit