Search results

1982 1992, but it's Friday today.

I bought my COBs a while ago, prices have gone down at kingbrite and up a little at mouser. My order included a dozen 100mm lenses--not sure if I'm going to use them, probably not at first. My latest order was for a dozen CXB3590 5000K CD (passive veg) and it was $40 for shipping plus 4.5%...

I'd never dealt with alibaba before so I bought the first four CXB3590 from Mouser for about $80 each and the rest from Jerry for maybe $60 each, delivered. DHL is extremely fast, like a couple days to Seattle. It was easy enough to deal through alibaba, pretty much like ebay. Jerry sends...

We can compare the different Cree series with this spreadsheet: http://pct.cree.com/dt/index.html I have some CXA3050 3000K that I doubt I'll use, the W2 bin just looks lame on paper compared to the CXA3070 AB. I have a dozen 72V CXB3590 3000K CB for my active bars. I've thought about making a...

I'm all kitted to build actively cooled 16 inch x 3.945 bars, three COBs running 1050mA: 72V-36V-72V, 3000K-5000K-3000K for 185W (plus driver). But if I were starting over, I would build passive triple bar luminaires and use the HLG-185H-C700 to power eight 36V COBs. That is about 25W per COB...

Fire safety is why I've spent thousands on LED over the past few years.

At least we don't have to worry about brightness bins with drivers; they'll be around a while before obsolescence. The 185 is a good series, I'm about to give myself a pair of 1050mA for Xmas.

lumen-geek, I wouldn't recommend running a power supply outside the specifications as a general practice. I like bassman's idea of going up to the next Mean Well power level, like this for a series circuit (instead of parallel)...

HeatsinkUSA has 10% off for orders over $100 until the end of this month. Same code as before: GIVEME10

Eight CXA2530 total 295V @ 700mA @ 25C according to the PCT. http://pct.cree.com/dt/index.html I'd expect the driver to clamp the current down to 678mA so the wattage does not exceed 200 when first powered up. Vf of the string is 290 @55C. You'll be maxxing out the power supply but I think it...

Copied from angloinfo.com: "You cant buy 99% in France but you can get 95 or 96% and you will find it in leclercs where they have the bottles of acetone and distilled water Posted on: 04/11/2013 at 12:32" I suppose I would use clean, soft cotton or Kimwipes with water. Kimwipes are "Delicate...

"Recommended Chemicals In testing, Cree has found the following chemicals to be safe to use with XLamp CX family LEDs. • Water • Isopropyl alcohol (IPA)"

I got back into studying LEDs fairly recently, I'm only familiar with the Cree CXA3070, CXA3590, and CXB3590 lines. (The CXA3070 seems like a good buy.) The Veros are good, I'll let someone else recommend a supply.

What matters is keeping the voltage drop of your LEDs within the constant current range of the power supply (driver). If you have a major brand COB like Cree you look at the voltage versus current graph to see more exactly what the forward voltage (Vf) will be but I don't see that here...

I've only been designing using the high-dollar Mean Well supplies. Check the "how to power" thread for likely ebay vendors of cheaper stuff. https://www.rollitup.org/t/diy-leds-how-to-power-them.801554/

That looks like a constant voltage supply. Most of us are using constant current drivers. What COBs are you using? Edit: another ebay listing shows the label "for switch-mode power supply loads only" http://www.ebay.com/itm/Oneac-Holdup-HU200-3-Ride-Through-Power-Source-New-/230612198074

The Mean Well HLG-185H-C1400A (or B for external dimming pot (optional)) will run four of your COBs at 1.4 amps. The new HLG-240H-C1400 type will power five (36V) COBs.

My smart meter takes a reading every 15 minutes. Spikes would not be detected.

If you start bleaching your buds and can't raise the luminaire any higher.

I'd be more worried about the blue spike in a high-powered COB veg room. (But not as much as when I had a 1,000W MH in there; cheap welding goggles were not comfortable.) http://www.cree.com/~/media/Files/Cree/LED Components and Modules/XLamp/XLamp Application Notes/XLamp_EyeSafety.pdf "To...