Hey Rollitup community,
As many here I'm thinking of giving a try to DIY-build COB LEDs. So i started reading datacheets, comparison charts and even dummy electrical engineering books (as my knowledge of current electricity and circuits is not that good since highschool times hehe).
So i set my mind on the (almost)all-favorite Cree CXA3590. By reading around i found @SupraSPL infos about the Watt dissipation of those arrays at different currents (in mA). here is the reference thread https://www.rollitup.org/t/gonna-do-my-first-diy-led-with-cree-cxa3590.854157/
so to keep things short my understanding is that at 1.5A the array will draw 150w, and when compared to the cree datasheet at this Amperage it will run at aroun 120% relative luminous flux. lets say this array emits 10000 lumen at this binning it will produce 12000 lument in this setup with 150W drain.
however, if you run 2 arrays at 1.05A each they should consume 80w each, and according to the datasheet again they would produce around 90% of relative luminous flux, ie around 9000 lumens each. in this setup you would have 18000 lumen produced for 160W.
even more if you run 3 of them them at lower current (700mA) they will draw around 50W each and produce 60% RLF, ie 6000 lumens each. this setup would produce again 18000 lumens for 150W total.
so my question is: did i understand the theory behind this correctly? does it actually work to run multiple arrays at a lower current to achieve higher light intensity for the same amount of W? or am i missing something big here?
i'm asking because one of the few reliable sources to order those COBs requires multiple purchases per order. so even if i have a quite small growth space (80cm x 80 cm growth tent, for one plant at the time only) i would make a multi-COB fixture rather than a single COB running at 150W.
thanks in advance for your answers
As many here I'm thinking of giving a try to DIY-build COB LEDs. So i started reading datacheets, comparison charts and even dummy electrical engineering books (as my knowledge of current electricity and circuits is not that good since highschool times hehe).
So i set my mind on the (almost)all-favorite Cree CXA3590. By reading around i found @SupraSPL infos about the Watt dissipation of those arrays at different currents (in mA). here is the reference thread https://www.rollitup.org/t/gonna-do-my-first-diy-led-with-cree-cxa3590.854157/
so to keep things short my understanding is that at 1.5A the array will draw 150w, and when compared to the cree datasheet at this Amperage it will run at aroun 120% relative luminous flux. lets say this array emits 10000 lumen at this binning it will produce 12000 lument in this setup with 150W drain.
however, if you run 2 arrays at 1.05A each they should consume 80w each, and according to the datasheet again they would produce around 90% of relative luminous flux, ie around 9000 lumens each. in this setup you would have 18000 lumen produced for 160W.
even more if you run 3 of them them at lower current (700mA) they will draw around 50W each and produce 60% RLF, ie 6000 lumens each. this setup would produce again 18000 lumens for 150W total.
so my question is: did i understand the theory behind this correctly? does it actually work to run multiple arrays at a lower current to achieve higher light intensity for the same amount of W? or am i missing something big here?
i'm asking because one of the few reliable sources to order those COBs requires multiple purchases per order. so even if i have a quite small growth space (80cm x 80 cm growth tent, for one plant at the time only) i would make a multi-COB fixture rather than a single COB running at 150W.
thanks in advance for your answers
