Can I ask who you ordered from? I would like to jump on the Z4 while I can. Thanks!The CXA3070's just arrived however the ones received are not Z2 but rather Z4. Should I return or keep? Seems I got a free upgrade however is't the Z2 more efficient?
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Do you even realize how inefficient that is...PF I will retest the maximum vf of the fasttech 650mA and 900mA drivers and report back with their output on the other thread. I grabbed a bunch more and now that I have a pair of reliable multimeters it is 10 times faster to test their efficiency.
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Man this thread is moving; I hadn't looked in a few days and had to read like 6-7 pages - it was OK though ... I was sad to hear about digikey and Canna's 2700k order but on the bright side at least I can save up some money for the next order. I just wanted to give a status update on my experiment with 4 3070s I've got everything working but I've had some issues with the fans - I think I blew them out with too many amps they are rated at .25mA and the wall wart I had them hooked up to were 12v 850mA; I think I just need to throw a resistor in there.
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Supra what kind of thermal tape are you using? the thermal paste and electrical tape just don't cut it.
Here is a picture of the drivers:
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I like these drivers because they have a volt adjustment so they are rated 48v/1.25A but I adjusted them all the way down and I'm getting 36v/860mA; this will give me a chance to play with the volts. I also like that it has connections for two leds and slides onto a din rail.
I still have tons to do before I will have a setup that I will feel comfortable flowering with but that is OK though
Thanks again to Supra and his dedication to this thread.
Do you even realize how inefficient that is...
That's a tray. Think of it as a buying a led by the ounce, ha ha. The tray is how the distro gets them from the factory.How much did you pay for those CXA's and where were you able to get them? It looks like an engineering sample.
88%-90% efficient depending on the driver. That includes the AC-DC conversion and the constant voltage to constant current conversion. Due to the laws of physics it is very hard to get more efficient than that, especially considering the give-away price for these drivers $10 each.Do you even realize how inefficient that is...
By using multiple smaller cores you amplify the eddy losses developed inside of each of them. you can make a single CV source from a handful of components in a few hours that would drive all those LEDs...88%-90% efficient depending on the driver. That includes the AC-DC conversion and the constant voltage to constant current conversion. Due to the laws of physics it is very hard to get more efficient than that, especially considering the give-away price for these drivers $10 each.
KNNA taught us way back that constant current drivers were the way to go, but in those days we were using multiple colors on one string with a variety of vFs so it was a necessity. Now with COBs we can get away with constant voltage, but I still prefer these drivers unless you know of a better option? If I recall you are using large benchtop power supplies, have you tested the overall efficiency of that system? I suspect they cost more than $10 each...
Of course I am not going to run them all in a pile like that picture, they will be mounted on a board and spread out as much as possible with plenty of air flow.
Wouldn't that create a very high voltage in the grow room? I will have up to 20 COBs in each room. Currently my DC voltage is no higher than 36V.By using multiple smaller cores you amplify the eddy losses developed inside of each of them. you can make a single CV source from a handful of components in a few hours that would drive all those LEDs...
If you know how to wind your own coils, yes. I thought this was a DIY thread....Wouldn't that create a very high voltage in the grow room? I will have up to 20 COBs in each room. Currently my DC voltage is no higher than 36V.
Even if we build a custom power supply, would we be able to reach above 90% efficient?
Holy shit. Now that makes you step back see how much more each bit countss.....offer me a 95% efficient driver, I would save 37W...