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growmau5 did a bunch of sided by sides with kWh of flowering time factored in on his youtube channel. cant remember if he counted veg but i think the veg times were the same for both wow mongo, its been a while, glad to see you are onboard with LEDs! i personally dont use reflectors as they...

which ideally are better anyway... a proper photometric lab is about a half a mil investment and thats just the equipment, not counting the time to make sure everything is NIST calibrated, keeping up with latest measurement standards, etc

they dont...

"Gavita" not "Gravita" bothers me that chilled has it wrong on their site. attention to detail is kind of the standard at this point

theyre not in the habit of A/Bing other tech.. but maybe they should be. Their light crushes that indagro

exactly! ive heard of guys getting 3p+ per hps but they always were monsters with like 8 week veg

best episode ever. Fucking Motorhead in your living room

@Lucky Luke i fucking love your avatar

at the diode level. higher when run super soft (your cost per watt goes way up), and lower when run hotter. and then knock off 6-10% for a driver and even more if the fixture uses optics

yes depends how hard you run them, like any LED heres the HLG 550 we are talking about 1179 PPF/507W = 2.29 umol/J https://cdn.shopify.com/s/files/1/1538/8585/files/L101705401.pdf?12227503688760624565 PLC 6.2, 6 cob vero light = 2.01 umol/J http://www.pacificlightconcepts.com/product/plc-6/...

im not the greatest grower on the planet but in 20 years i *never* cracked 1 gpw until i started using LEDs

heres another one from that era:

not all of them are good lights no! or there would be no incentive to use one type of light over another. CFLs to the best LEDs span a huge range of photosynthetic efficiency, like 0.7-2.2 umol/J the following is worth a read despite the fact that the LEDs in that study were from 2013-2014...

theres a lot of factors, strain, space you have to grow in, growers skill, etc etc in general (real round numbers) SE HPS: 0.6-1.2 DE HPS: 0.8-1.5 CMH: 1-1.6 LEDS: 0.5-2.0 (huge range because LEDs cover so many different designs, there is no "standard" a typical phosphor white of good system...

you have to understand its no different tech than any of the rigs from last several years who have been pulling 1.4-1.7+, in fact its on the upper end of efficiency of those

1 gram per watt would be pretty bad for an LED rig of that efficiency

not a given at all. every room is different and you cant equate VPD with a given light source based on all the different climates and growing styles out there at the end of the day if you have 2 gardens with the same amount of metabolic activity they are transpiring equal amounts of water. how...

look at the test reports as opposed to datasheets for actual driver capability some reasons people select lower voltage drivers: -more economical per watt -more holder/cob configuration options -more flexible for expansion

yes but when comparing to (proven) typical cxb spectrums its a spectral advantage youre after, no?

one uses $300 less electricity per year and doesnt require $50 a year in bulbs, and cuts investment in cooling equipment by 40%