Docta Haze
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- Oct 30, 2015
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Hey THC-farmers! I'm looking to upgrade my 600w HPS to three qb96s. I am hoping to find someone here who has experience with these and can guide my new setup. I'm using a 3'x3' tent, and I'm looking to power these at a low wattage. I've read 30-40w per square foot is a good target for quality LEDs. So 270w to 360w for a 3x3 tent.
Max power rating with passive heatsink cooling is 4.2A at around 56V = about 235w. I've read, however, that many people will provide active cooling after 120-150w.
HLG provides this "flux characteristics" table:
hlg-qb96-elite-v2-anyone-out-there-using-these-jpg.906443/"
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I am thinking about running three qb96s in parallel with a meanwell 320H-54B. The meanwell driver is rated up to 6.0A, so each board would recieve about 2.0A of current at 53v for a total of about 106w per board. I've read that the meanwell boards push past their voltage rating, but I'm not sure this is true of their amperage rating too.
At 53v the boards have an efficency of 2.4 μmoles/joule. If my math is right, 106w should generate 254ppf per board for a total of 762ppf. Then if I divide this my by the square meter space (i.e. 3x3 = .9m x .9m) I can figure a ppfd of 911 (762ppf/.836sqm). So at max power I can hope for a 911ppfd during flowering.
As a follow up to this math a poster called Or_Gro on a couple of other cannabis forums provided some light testing results of these fixtures:
hlg-qb96-elite-v2-anyone-out-there-using-these-2-jpeg.906447/"
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width="1200"
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Here he runs three qb96s with a meanwell 240h-54a in a 4x4. At 120w within a 3'x3' space he measures 400-800ppfd, very close to what the math predicts. My idea, rather than use three 240H-54a drivers, is to use one 320H-54b driver and run these fixtures in parallel at around 106w each.
What do you think? Is this going to be enough light for a decent yielding, high quality grow in a 3x3?
Thank you all for your thoughts and ideas!
Max power rating with passive heatsink cooling is 4.2A at around 56V = about 235w. I've read, however, that many people will provide active cooling after 120-150w.
HLG provides this "flux characteristics" table:
I am thinking about running three qb96s in parallel with a meanwell 320H-54B. The meanwell driver is rated up to 6.0A, so each board would recieve about 2.0A of current at 53v for a total of about 106w per board. I've read that the meanwell boards push past their voltage rating, but I'm not sure this is true of their amperage rating too.
At 53v the boards have an efficency of 2.4 μmoles/joule. If my math is right, 106w should generate 254ppf per board for a total of 762ppf. Then if I divide this my by the square meter space (i.e. 3x3 = .9m x .9m) I can figure a ppfd of 911 (762ppf/.836sqm). So at max power I can hope for a 911ppfd during flowering.
As a follow up to this math a poster called Or_Gro on a couple of other cannabis forums provided some light testing results of these fixtures:
Here he runs three qb96s with a meanwell 240h-54a in a 4x4. At 120w within a 3'x3' space he measures 400-800ppfd, very close to what the math predicts. My idea, rather than use three 240H-54a drivers, is to use one 320H-54b driver and run these fixtures in parallel at around 106w each.
What do you think? Is this going to be enough light for a decent yielding, high quality grow in a 3x3?
Thank you all for your thoughts and ideas!