I agree w/pete. you need a timer! you can get a cheap one for 5 or 6 bucks. light leaks are places where light can get into your grow room. to check, go inside your growroom w the lights out and see if you there's light coming in.

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helpful links:
cfl-hps-how-much-light
el-cheapo-guide-lighting
drying-curing-your-buds
med-strains-specific-uses