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ah its really not a big deal, watch a turorial. Take you time with each step. But if youre in the US; the need to do DIY is not so big anyway. You have so many good deals going on there.

id run 8 boards of them in a 2x4 in parallel with a 240 or 320 watt driver. Just buy 2 long, strong aluminum profiles, just under 4 feet long, drill holes in the end for hanging gear, and then screw or glue 4 boards on them with equal spacing. Then hang these fuckers in the tent. if you have a...

well, the footprint and the price are exactly the reason why you want to use lots of these boards and power them lower. I use 6 of them in a 70x70, you can fit 8 in a 80x80 or 90x90 and easily 10 in a 100x100. If you stay at 40 or 50 watt boardpower you dont need heatsinks. I just glued the...

i also have these boards, but im using 6 of them on an ELG 240 watt PSU. Those are SE-rank diodes with A2 voltage bin. so mediocre stuff but not the very worst. For the epistar reds i dont have any data, so i just ignored them when calculating my light. If you use them like they are "meant to...

just for curiosity, whats your electricity price per Kwh?

you dont really get the point, do you? Im not trying to convince people that the LM281B+ is overall better...its very obviously the older generation. But its not 165 vs 220, its far from that and a light with 301 is not automatically better. If youre on a budget, you can use 2-3 times more...

that was a razorsharp conclusion

why would you do that? Well maybe in a case like above, when a sellers offers you a Version with 281Bs for much less, its very helpful to know what bin it is. You might end up getting LM301 thats not really that much brighter.

Youre playing stupid now. Im obviously talking comparing at same current. Because it was you comparing at different currents, not me. Make that clear please. You postet these numbers, 165 vs 220, while you should actually now that these numbers are taken at different currents, 65ma vs 150ma. You...

What current are you talking about? What rank, what bin? very inaccurate answer. There are LM281B+ top ranks that make 200 lumen/watt and there are 301s that dont. On average they are obviously more efficient, but without knowing what rank and voltage bin you cant know. And that exhausting 165...

Its not about lumen, its about PAR Efficacy. Obviously 660nm bring the colour temp and overall lumen down.

guys does anybody have data on the epistar 660nm red they use on these boards? I mean they are red and therefore you can think they will raise overall umol/J and not bring it down, right? they are always gonna produce more umol/J than the 281s or 301s that are built on the board? If not how...

vipar Spectra KS2500 for 210 Dollar.... https://www.viparspectra.com/products/viparspectra%C2%AE-ks2500-250w-led-grow-light man you have so many good Deals is US, the lightmarket is on Fire. KS3000 is also slighty cheaper than before, 320 bucks. But this one seems by far the better deal, even...

do these diodes look rectangle or square to you? Pretty square to me for sure...man if this are 3030 diodes while their website and their Youtube Acc. still claiming its Lm281b+ would be a good laugh. He said 3 times in the show its LM301B...how can somebody misspeak 3 times. need a better...

oh...i didnt even know there are so shitty Lm301 ranks...in the Samsung LED Component Calculator you only find SK to SM rank for 301B. I was already wondering, because there are so many LM281B ranks, but only 3 for the 301.

the diodes are very obvious samsung clones...even the design of the datasheet. Efficiencywise it seems to be a pretty successful clone. Good thing they say it and dont try to appear as Samsung though. Same with not stating fantasy numbers. Many budget-companies play a totally different game. I...

Its a steal. It also seems a good company, the numbers they put out, 2.66 system eff., seems totally legit if you look at the test. Too bad i just built my own lamp. They offers you have in US are so much better than anything we have here in EU.

Mogobe Octopus, 300 watt light for 189 dollar sale. Check out Coco for Cannabis Channel on YT for review. its efficient. Crazy deal imho. I live EU unfortunately. The PSU alone is worth 70 bucks...

would have liked to see them as well. I dont know how intense the light is, but on the pic it looks way higher than necessary. Why would you hang it that high if the fixture already covers the complete space.