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i guess the only easy way to get transitionless warm to cold tunability is by using TWO dimmable drivers inversly connected to the same 3 contact potentiometer

so what are the actual g/kWh numbers of the best LED grows compared to the best HPS grows?

why don't u work with bridgelux?

and they get less gpw right? anyway you lose some photons, because the phosphor layer of the 90CRI LED is different. you can use these conversion factors (got the from the user livinglight from Ledgardener forum) to get from Lumen (what humans see) to Photons in the range of 350-750nm (what...

cons: 90cri doesn't even exist in that bin. check the lm561c datasheet. so another scam. apart from that. 90cri doesn't perform better than 80cri for plant growth.

you mean because of the bad tape? i mean everything else is exactly like you ordered. you can't get 50% refund if you ordered the wrong product. anyway, this is the tape i have and i am very happy. http://s.aliexpress.com/IJveI3QJ? i used it for attaching my rigid strip to aluminum profile.

it could be a LM561Y. no idea. and he could have used another LEDstrip for the Test report. you would have to be sure and have proof to get a refund. anyway, it's not about flexible or rigid, but constant voltage or constant current. i was however hesitant to order even their constant current...

if the test report isn't fake

205lm/w is absolute maximum with very low current. very unrealistic. you should rather look at the samsung fseries gen3 which has 175lm/w (and is using lm561C) https://www.samsung.com/led/support/tools/engine-calculator/ so with the f-series gen3 you reach 202lm/w if you supply it with only 10%...

i posted three images from another user who bought genuine diodes from digikey. you can compare them and make up your own mind which diode these BRIGHT strips could have. *it could also be a LM561Y. your LEDs look like genuine samsungs to me. it could be any of those. lm561C s6 lm561C s5...

you shouldn't have bought constant voltage flex strips (= with resistors), because that's the reason why lm/w is lower. you lose efficiency with the resistors, but on the other hand they are cuttable every few LEDs as a result. they also have constant current ones, and i would be really...

one * stands for a p value of <0.05 . which is still plenty significant. anyway ordered me 5pcs of Vestas and 2pcs 75W TRP-drivers to power 2700K and 5000K rows individually, should i ever want to (78$ shipped +7$ taxes). i can compare them to my F562B 4000K. but i don't own no par meter, just...

they only tested to 800. but the graph would go on. also note this other excerpt from the study i linked before:

have you actually looked at the McCree curve? there is stuff going on beyond 400-700nm i just wanted to show (relative) spectrum differences

the problem with this apogee par meter is that it only measures Spectral Range 389 - 692 nm. the CRI90 strips produce more photons outside of that region compared to other strips, so PAR will be lower. see orange region: by the way: how do you want to make them tunable? use 1 drivers for 2700K...

they have done it :

if you run one F564B at 1.8A u would make 204 umol/s (at an efficiency of 2.35). *assumed 50°C. comparing this to two vestas: they would emit 224 umol/s (at efficiency of 2.27) in this scenario two Vestas give you 10% more photons at 3.5% lower efficiency while saving you 6$ compared to one...

YPF difference between VESTA and F564B 3000K is 18% @ 49.6W. the price difference on digikey is 61% or 56% for 10pcs or 50% for 25pcs Vesta gets you double the amount of photons per dollar. here the calculations by LivingLight, with a combined graph for Vesta, compared to 3000K F564B (PS...

the user LivingLight at LG forum calculated speficially for vesta: i am not grasping everything but when i multiply the lm/W of each strip by the "lm to photon conversion factor" i get this: 129 lm/W * 0.0175 = 2.26 VESTA 2700K CRI90 (0%) 135 lm/W * 0.0169 = 2.28 VESTA 5000K CRI90 (+1%) 144...

i searched this thread for YPF, but found nothing. (how) can it be calculated? also the original post looks way to complicated for me :roll: