ChiefRunningPhist
Well-Known Member
The question of how much of a certain color is often asked. I'm not professing to know the exact ratios, but attached is a little excel file to help you figure it out.
You only need to enter the number of chips, your desired brightness from 0 - 5 and then a custom efficiency if the LEDs are less efficient than the ones I've modeled the file after. The wattage is populated after you've entered your brightness, and this is the value you'd want to base your design from. ALL inputs are based on a per ft2 basis. The PPFD is assuming that the # of chips you entered is meant for 1ft2, so if you had an 800 chip panel you were using in a 2×4, in order to model average PPFD, you'd take 800 chips and divide by 8ft2, to arrive at a total of 100 chips/ft2. PPFD is the only cell that will be effected like this. μmol/J, system efficiency, ect should all be golden regardless. Its not an exact science but just to get you close to your target. The chips used in the file are actual chips and the most efficient in their respective color. The efficiency (if not customized) is dynamic and scales with added power for all the chips I was able to find multiple power/efficiencies for. The static efficiencies are the values calculated for max brightness so if anything they should increase with less than a value of "5" brightness.
You'll need Microsoft excel to use.
This 100 chip/ft2 example would end up scaling to 442.32W & 1500+ PPFD in a 2×4 area... Walls ect will absorb some of the photons emitted, so this is just a system estimator...
55.29/ft2 × 8ft2 = 442.32W
You only need to enter the number of chips, your desired brightness from 0 - 5 and then a custom efficiency if the LEDs are less efficient than the ones I've modeled the file after. The wattage is populated after you've entered your brightness, and this is the value you'd want to base your design from. ALL inputs are based on a per ft2 basis. The PPFD is assuming that the # of chips you entered is meant for 1ft2, so if you had an 800 chip panel you were using in a 2×4, in order to model average PPFD, you'd take 800 chips and divide by 8ft2, to arrive at a total of 100 chips/ft2. PPFD is the only cell that will be effected like this. μmol/J, system efficiency, ect should all be golden regardless. Its not an exact science but just to get you close to your target. The chips used in the file are actual chips and the most efficient in their respective color. The efficiency (if not customized) is dynamic and scales with added power for all the chips I was able to find multiple power/efficiencies for. The static efficiencies are the values calculated for max brightness so if anything they should increase with less than a value of "5" brightness.
You'll need Microsoft excel to use.
This 100 chip/ft2 example would end up scaling to 442.32W & 1500+ PPFD in a 2×4 area... Walls ect will absorb some of the photons emitted, so this is just a system estimator...
55.29/ft2 × 8ft2 = 442.32W
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