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it dosent matter if its ppfd or lux. what matters more is getting a nice uniformly spaced grid of 100 points or more (the one you linked above was 121 points). note its pretty damn uniform except in the corners so be prepared to measure 4" from the wall. youd really need an empty tent and crawl...

can you link a PAR map so we can see the difference? nor would a COB rig in modern times

then make sure you get it tested on the goniophotometer as well

call the guys at quest ill bet they can steer you in the right direction as to what % of an ACs cooling load is dehumidification of course they know their dehueys well but they also have a combo dehuey/minisplit now

depends. if youre only getting a half a gram per watt with a 600HPS you might not get 50% more yield in the same space by replacing it with the LED. The LED certainly has about 1.5X as much light as a SE 600HPS, but it depends what you do with it.

roots like cool temps to an extent. its the best remedy for rootrot and other nasties

any -36A driver or -36B driver would be fine

https://www.rollitup.org/t/par-test-of-cobs-vs-samsung-561-boards.942636/#post-13616975

look up the old "cheap and cheerful" citizen thread, it had umol calcs for all the different spectrums. you can then use the chart above to estimate the relative umol/J based on those currents and your current. you can also use the citi calculator but thats in lumens not umols. either way you...

thats not accurate. 10.4 ppfd/W is arbitrary to my test and has no relationship whatsoever to your space. i have other tests in my sphere where the numbers are over 40 ppfd/W that doesnt mean there is 4X more light

if the light from 600W of HPS is what your tent needs you can get that same amount of light with 400W of LED, which will create less heat. You'll also want to run higher temperatures with LED so theat offsets your cooling needs yeah that would be 85 g/SF and over 2 g/W which i dont want to say...

600W in a room is 600W in a room whether its an LED or an HPS or a toaster

do you have any other way of quantifying growth other than height? targeted LED spectrums will definitely create shorter bushier branchier plants than sunlight maybe you should be measuring leaf mass or leaf area or something you should be running hotter with LED than you do with...

depends on the optics cobs without reflectors have similar radiance patterns to discrete diodes. it all comes down to number of emitters and spacing between them. if you wallpapered the roof of a tent with any of the following: -cobs (like 25 cobs per square foot) -boards (continuous with no...

the fact that 550W @ 2.3 umol/J = 1265 umol and 1000W at 1.3 umol/J = 1300 umol you cant claim any kind of accuracy when you disregard efficiency entirely its not useless in general, just for quantifying total output of a fixture. its analogous to measuring your engine's horsepower via the...

actually a hard and fast rule that 750W of LED is equivalent to 1000W of HPS is misinformation in and of itself because that would imply that all LEDs are the same efficiency and all HPSs are the same efficiency you could be compating a 1.3 umol/ J blurple vs a 1.7 umol DE HPS or you could be...

nothing shitty about the 3590s if you want to match efficiency of the cobs to about the same level as the boards run the boards at 150W each and the cobs at 35-45W each/1050-1300 mA you can get a free luxmeter app for your phone which is good enough to balance the light spread

because 1000W for 12 weeks costs twice as much as 1000W for 6 weeks so you better be darn near doubling your yield over that time

if price is your factor just diy. you can buy boards and cobs cheaper than the preassembled units and expand/upgrade them later as well nothing coming down the pipe will be "blowing anything away" though we'll gain a few percent later this year from the new boards and cobs.. but thats time you...

yes they are lm301b