Themadhippy Posted August 29, 2003 Share Posted August 29, 2003 sorry if this is regularly asked but what are the optimum tempreture and light level for a grow room? also how many air changes per hour/minute? initally looking at soil growing,are they diffrent for diffrent systems? im in the design stages of my grow space and being a typcal engineer i want to calculate everything to the nearest mile Link to comment Share on other sites More sharing options...
BushDoctoR Posted August 30, 2003 Share Posted August 30, 2003 optimum temp is bettween 26c-28c, above 30c will slow growth, above 40 will damage plant. humidity is fine anywhere bettween 40%-60% they say you should have 50w of light per square foot, but i think thats only aimed at HPS and its not very accurate you should change the air once every 3 minutes (20 per hour) to work out the volume of air in your grow room multiply the growroom dimentions (in metres) to work out the minimum fan size multiply the the volume of air in your growroom by the number of air changes needed per hour example: (1.65m[h] x 1.96m[w] x 1.2m[d]) x 20 = 77m3/hr [b-Dr] Link to comment Share on other sites More sharing options...
Themadhippy Posted August 30, 2003 Author Share Posted August 30, 2003 (edited) cheers BushDoctoR,time to the brain in gear sevral places recomend 2500 lumens per foot for the light level,that gives around 1.2kw for an 8 x 3x3room ,or 2.5kw using 50w/foot Edited August 30, 2003 by Themadhippy Link to comment Share on other sites More sharing options...
KenAbyss Posted May 12, 2004 Share Posted May 12, 2004 (edited) Ive just come across this thread and it answers most of my questions, what's the MINIMUM temp to get away with - and is 50% humidity better than 40% or 60%, I know you say anywhere in between but does it matter? Edited May 12, 2004 by KenAbyss Link to comment Share on other sites More sharing options...
BushDoctoR Posted May 13, 2004 Share Posted May 13, 2004 optimum temp is bettween 26c-28c sorry, i was wrong about that bit the optimum temp is thought to be 23c-26c temps bettween 18c-28c are good i would say the odd fluctuation will be fine plants will grow fine (a little slower tho) with temps upto about 34c, but if your temp is stuck up there you need to sort it out [b-Dr] Link to comment Share on other sites More sharing options...
tha_fiend04 Posted May 13, 2004 Share Posted May 13, 2004 below 15/16c slows growth u want humidity as high as poss in veg stage 70% rh= produces good fem rations on a 18/6 light schedule in flower u want your humidity below 50% to avoid mold-if u have dense/big buds u want it lower 30-40% is cool :tup: Link to comment Share on other sites More sharing options...
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