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can anyone tell me the difference between 600w & 400w bulbs over plants, & how they work, i'm trying to find out how they produce the difference in yield etc, thanks ok . .

hi, i'm drpressure600, i'm new here, i'm from dublin in ireland & i'm grow a couple of years now, i'm looking forward to making some new friends here, take care . .

hi, i'm from ireland, got this address from a friend in san francisco, how are ya'll . .