4 Answers
What is the wavelength of led needed if there is NO daylight for growing?
You're best off using white light LEDs. They match the PAR spectrum well. Unless you're trying to squeeze the last $100 out of a pot grow, it doesn't matter what you use. The Viugreum panels (on ebay) are the best I've used. I try to get 4000 - 5000 CCT but anything will work fine. I use the highest wattage that fits my circumstances.
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Brandon ChamberlainNoel F Leonard light spectrum is measured in nm......3500k is a shade of white, which is a phosphorus coating.
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Noel F LeonardBrandon Chamberlain what ever you want to measure it in it works for me
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Noel F LeonardThe only lights I've ever seen measured in nanometers have been those blurple lights
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Brandon ChamberlainNoel F Leonard wasn’t trying to be rude, just informative. Cheers
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Noel F LeonardBrandon Chamberlain same here Kelvin is a measure of mixed colors and nanometer is a specific spectrum. No ones buying cobs or quantum boards for growing plants measured in nanometers. That's just going to confuse the new people, as this is a for beginners page.
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Brandon ChamberlainNoel F Leonard that is true too. My vero 29’s are 3000k cobs. Then you also get into the CRI, it’s pretty overwhelming for someone getting into LED lighting
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Noel F LeonardBrandon Chamberlain cri, par all that stuff, all I care is that light is bright af, lol. I try to keep it simple when asked questions as many of these people are just starting out. Just happy to steer people away from buying junk lights. Built 3 different cob based lights before I discovered quantum boards. No point in building another cob light again for what you have in parts vs a few qb288 boards.
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Noel F LeonardBrandon Chamberlain don't the veros have a holder and a plug built right in so you don't need a separate holder?
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Brandon ChamberlainNoel F Leonard yes And they are solderless connection. In conjunction with wago connectors, pretty much snap together. When I built my fixtures you couldn’t get QB’s, they were all on back order.
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Brandon ChamberlainNoel F Leonard this was at the introduction of the Samsung HLG-550’s. I had a hard time getting good bins of the vero’s until the QB’s came out, most supplies bought up all the stock. So I guess I have been behind in technology since then even, but I can’t complain.
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Ross BauerLots of this is kinda over my head but I wanna know more
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Noel F LeonardRoss Bauer I got 160 bucks to door for a complete dual qb288 board light from Meijiu lighting with the lm301b chips, it's a nice light, cant even buy the parts to make 240 watts of cob lighting for that. Just ordered 4 more boards with the lm301h chips from kingbrite. Got a sdr-240-48 din rail mount driver I scored off Ebay a few years ago for 10 bucks I'm going to drive them with. Driving them at 60 watts a piece from what I've read you don't even need a heatsink with them, but I'll probably still mount them to a piece of aluminum plate at least though.
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Noel F LeonardBrandon Chamberlain couldn't you match all those to one driver, or did you want to be able to dim separate zones? Could have squeezed some more efficiency out of it with one single driver, depending on how many volts a vero29 runs at. My two cob lights are one with 4 citizen clu48-1212 cobs and the other is a dual light using 2 50v Seoul semiconductor chips I picked up cheap. And my first one that still works, it's a single cxb3070 mounted to an old xbox360 GPU heatsink with a muffin fan on it driven by a cheapie 50 watt driver, it was the first led light I made. Once I saw how bright those little things are I dumped florescent and hps forever, really no point anymore.
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Brandon ChamberlainNoel F Leonard mainly this setup was specced for efficiency. They are hlg-240 drivers 1400ma iirc., I run the cobs at 50w each for a total of 600 on that fixture. They are 96w max per cob but ran at 50w I get the most lumens/watt. It’s a growmau5 OG spec. It’s on one of his YouTube live videos.
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Noel F LeonardBrandon Chamberlain yeah I've learned a lot from watching his videos and the other guy I can't remember his name green Jean Garden or something, I think the one guy went to work for one of them lighting companies chilled lighting I think
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Brandon ChamberlainNoel F Leonard yes, he’s partnered with chilled logic now. Their 600w fixture with 6 of their QB pucks is only $650 and puts out 2.5 umol and my 2 year old 12 cob setup only does 2.2 umol at the same wattage. And I got it with the discount for $850, and had to build my own canopy rail. I would hands down go to a QB setup if I needed more lights.
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Noel F LeonardBrandon Chamberlain the light spread is amazing on them. For the hell of it I touched them with the back of my hand, they really arent that hot. Cant do that with a cob, you'll melt your skin.