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light quantity > light quality in most cases efficiency is its major benefit

i dont stock any of those, best to look at the datasheets hlg-120h-c1400 would prob be my go-to out of those 3 (most people use B models for constant currents though)

avaialble current derates with 110V input, see datasheet

i love those 15W screw in LEDs for this one per tray

hlg120 is prob same price as elg150

whats that big green blob?

a gamble but my bet is that it would light em up, possibly at a sligthly reduced current

DE HPS throws 1.7 umol to the plants. 60% less wattage would necessitate 2.83 umol/J at system level not aware of any commercial fixtures doing that now an SE at 1.3 umol/J, easy to match with 60% of the wattage, you only need 2.16 umol/J, which lots of top end fixtures can deliver these days

why? its easy to match the photon of a 1000W of DE with 7-800W of good LED. No reason it cant be done. nice garden BTW just take whatever wattage the gavita is running at and multiply by 0.7 to 0.8 to account for the difference in efficiency (and keep in mind that a lot of people run their...

all phosphor based cobs are "pumped" by blue mono leds in the 440-460 range. the blue "peak" you see on spectra is this shining thru the phosphor the big wide bump from 500-700 nm is the phosphor converting the blue into orange/red light. this is why chips (when they are powered off) have...

just run it till it dies. once 30% of the diodes are burnt use the drivers to power whatever is current on led tech

right there on page 2

yeah if you cant get 1 gram per watt with the 1.3 umol/J kind youre using it wrong

call it 50% and go from there for design purposes

youd be overthinking the solution big time

thats impossible

that one that is "taking longer" shoulda been cut weeks ago. its gonna yield 2 oz of larf

90 cri is a different phosphor and has a higher percentage of red from ~650-730

that was 90 cri which isnt usually available on boards. if youre constrained to 80 cri i might go for 3000k for flowering

if i had to pick one spectrum to flower it would be 3500k 90 cri i personally think the difference between 2700k to 4000k is not super dramatic. some people claim that 4000k has a big "hole" in the spectrum and isnt great for flowering but ive never seen anything to substantiate this