switch over size

michaelskunknasty

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is it true that plants double in size in the flowering stage? Should I switch over to flowering light when they are half way up my grow box? Also how close to a 400 watt hps can plants get W/o damage?
 

bizzy323

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they can double or even tripple in size when flowering. I have my light at about 11" from the top of my plants and it seems fine, but I will drop it down to about 8" after awhile and keep it there. Do you have good ventilation in your grow room? also do you have a fan blowing on the light?
 
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