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I have Vossloh Schwabe Metal Halide & Sodium Ballasts 250w, it is extreme hot I can't even touch it for 1 sec... Is this normal? Or I need to look for new ballast?

4.3 x 2.8 x 4.9 this is in feet's. They are 7-8 weeks old. I scare they will not fit in this room, cause I have there air fan too. My pots are 15L each.

My AK48 is ready to flowering, as I only yesterday end my grow room and today will complete ventilation. My big boy is about 27" tall other 4 pots is 20" . What to expect on flowering? I think my grow room is to small :D

My weed was all the time in my sun house, now they are 8 weeks old and ready for flowering, but I wonder can I flower them with 250W HPS and 3 CFL's each 23W which makes standart light for 300W cause 23W CFL = 100W regular bulbs I don't know how they call. So in fact I got 2700K CFL's spectrum...

Thanks dude... Will try now what I have and than make conclusions about size of fan :)

I measure all in feets and my result was 60 CFM ... My PC fan is 67/80 ... But what does it mean 67/80???? I think my fan will be alright

you talk about air circulating fan inside grow room or about exhaust or intake fan? Tomorrow I will turn all lights on and watch what temperature will it be only with circulating air fan inside grow room, no exhaust and no intake... Will see the numbers... Just measure my grow room... L 1.30m x...

I have about 2 months old AK48 feminized, 5 pots each 15L ... One is big about 60cm and ready to flower, others is about 40cm and ready for flowering to. They now is in my sun house but it is getting cold outside so I made grow room for them, I have everything done but don't have info about...

I don't really get it. I make everything like in formula, add all stuff, and my minimum CFM is 0.63 m3/3min but my PC fan which is 12cm x 12cm does 1.87 m3/min ... So I need fan which is 3 times smaller than mine, it sounds very weird. About temperature I can't do any math 'cause I don't know...

Hi growers. This is my first grow. I need information about CFM. I have 12cm PC fan for exhaust which is 112,13 m3/h so it will be 1,87 m3/min ... I will put behind fan carbon filter, so I think it will lose about 20% of CFM. And it will be about 1,5 m3/min. My grow room is about 1,5 m3 ... Is...