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there are too many examples to count that have been provided to date. If you understand plants and photons and that SE HPS produces 1.3 umol/J,DE produces 1.7 umol/ J, and decent LEDs produce 1.6-2.5 umol/J (and crappy LEDs 1.1-1.4 umol/J) the math is all there go look at growmau5's youtube he...

cant open pics- too big you can make them smaller in microsoft paint

the fact that they are even measuring a spectrum like that in lumens pretty much tells you all you need to know about their understanding of the product and OP i know you think people are ganging up but its the same thing weve seen over and over. in 99% of the cases when manufacturers cant...

might do better with this in the HID forum https://www.rollitup.org/f/indoor-growing.49/ as far as "changing the game" show me a manufacturer that hasnt claimed this in the last 30 years

id go a little closer than that for better results. the design of that chip is quite a bit different than the typical COB. I always used 12" on axis in free space with good results. you need to do it in the dark and make sure the sensor is level, and also make sure the cobs are similar CRI and...

just search this forum there are several threads about these exact same chips and also plenty of threads of people with the experiences of the cheap chinese lights. the conclusion is always the same - you get what you pay for exactly. i wouldnt assume those driverless chips are anywhere near...

x axis =power = DC input power to cobs y axis =PPFD/W = the PPFD measured at a given wattage divided by that wattage to give a relative measure of efficiency maybe "unitless" isnt the right word. In any case, that sphere isnt calibrated to a known NIST standard so while the measurements are all...

well you really only need one known chip, not all of them those arent "percent efficiencies", its unitless. more like the best chip is about 6% better than the worst (but those are all HQ chips) Thats a baseless assumption. You have no data on your chips so you cant draw any conclusions. the...

no motives other than to educate spot par readings tell you nothing about a lights efficiency other than the fact that it is producing light at a very minimum you need a chip of nearly identical CRI and CCT and known efficacy on the same cooling setup, to compare it against and even then its...

spot par readings will tell us nothing about their performance unfortunately

hoods have no reason to be electrically rated as they are not electrical components socket says 600V/1500W so it can handle any HPS on the market

the cobs you bought are prob in the 80s in efficiency in their onboard driver circuit, and the diodes themselves are low quality, efficiency and longevity at the end of the day they are likely no more efficient than HID quality $10 chips (or mid power strips, also cheap) air-cooled would...

i also had problems with cmh in cold temps have never had any problems at high temps really

this just popped up on ebay for $599 (no affiliation) not the latest model but fine for most people's purposes https://www.ebay.com/itm/183253248248?ul_noapp=true http://www.aibcusa.com/portable-led-light-spectrometer/comparison-of-mk350-and-mk350s

unless your power is DC, in all cases "driverless" means "i am replacing drivers with these inefficient on-board AC-DC circuits" spend less now... or spend less later

thru june 1st? lol

i do

i do not. Timber might be an option. More expensive than DIY of course, but same tech

since this thread is mentioning QBs i might as well mention ill have qb288 v2s soon

links would help nobody here has ever heard of kingbo so that almost certainly a bad sign