Something I don't understand about this is that the higher ambient temp shows a reduced voltage for the same current, but I always thought the light output was dependent on current, and as temps fell so did voltage. I've got mixed up somewhere, cann anyone straighten me out?67 - 70v for the 72v cxa 3590. Thats a tight fit...not sure if theres any wiggle room on the meanwell driver. 36v would be fine..
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Lately I don't think that's quite it. It's true but, really the heat is a by-product of the quantum electron leakage, is the latest conjecture, (hardly a hypothesis, much less a Theory)The higher temps "stress" the emitter and makes them work harder, just like our plants. I dono the science...just sounded good, right?
Lately I don't think that's quite it. It's true but, really the heat is a by-product of the quantum electron leakage, is the latest conjecture, (hardly a hypothesis, much less a Theory)
We had to solve electron tunneling in CPU chips or we were doomed to go no closer than 50 nm spacing of the circuit paths. Now we are way less than 1/2 of that. It was all about the current. And we know these CPU are high watt devices, so the trick was to make the work happen somewhere else and keep the signal currents very low.
So it seems in LED according to the latest. The higher you drive the current the more you drive electrons off the "road" so to speak. And those electrons can only dissipate as heat, so more goes to heat and less to light the higher the current, is how I am beginning to think about it.
Lately I don't think that's quite it. It's true but, really the heat is a by-product of the quantum electron leakage, is the latest conjecture, (hardly a hypothesis, much less a Theory)
We had to solve electron tunneling in CPU chips or we were doomed to go no closer than 50 nm spacing of the circuit paths. Now we are way less than 1/2 of that. It was all about the current. And we know these CPU are high watt devices, so the trick was to make the work happen somewhere else and keep the signal currents very low.
So it seems in LED according to the latest. The higher you drive the current the more you drive electrons off the "road" so to speak. And those electrons can only dissipate as heat, so more goes to heat and less to light the higher the current, is how I am beginning to think about it.
Interesting question and they give the Noble prize for the answer.More or less like a power line. High pressure(amperage) leads to more loss over the line.
So in theory a high voltage low amperage cob might have similar output initially to the same wattage through a low voltage high amperage cob. But over time the high voltage cob is going to degrade slower due to lower current.
This is of course assuming that both cobs are using the same material as a "jacket" to limit leakage.
So why do vero's perform better at higher currents? Do they somehow more effectively limit leakage with increased amperage? I always thought (per stardust) it was because the aluminum chip disperses heat better than a ceramic one.
Interesting question and they give the Noble prize for the answer.
And also interesting is they drive those FC Optos at 12a, and they run cool. That's the patent. A different cooling structure at the junction. But, the efficiency is about the amps not the heat and FCO does not compare favorably in the market, Cree Damn it.
I think it wouldn't run (over voltage protection would kick in). You'd have to dimm it to a current where the sum of Vf's is >= 144V. IDK any driver alternatives, but there's great COB alternative - CXB3070. These are great fit for HLG-185H-C-1400 and even more efficient at 1400mA.I'm trying to find a driver to run 4 V29s at 1.4A
I was originally going to run them in series and could use the HLG-240H. There is a high voltage version of this driver but the largest version is HLG-185H-C. It looks like it would be a few volts short. What would happen if I tried to run the 4 vero 29s with that driver?
Assuming it's not possible, are there any alternatives?
Edit: I looked around and apparently there is an HLG-240H-C but it's not listed at Meanwell's US website and apparently not for sale in the US (?)
Can request quote here: http://www.meanwelldirect.co.uk/products/250W-Single-Output-Constant-Current-Dimming-LED-Power-Supply/HLG-240H-CB-Series/default.htm
and here: http://www.sunpower-uk.com/product/250-6W-1400mA-89-179V-IP67-Rated-Constant-Current-Dimmable-LED-Driver/HLG-240H-C1400B/default.htm
I guess I will contact a US distributor and see whether they can be ordered.
These are brillant, so many flavours to choose from; Have you or anyone else made an order yet? I've sent an enquiry as I'm in europe.I meet a rep from, LSD led drivers, a chinese factory/company. He was chinese and it was hard to communicate, but I got the info I needed to check them out.
They are so damn close to meanwells. But...they have a bunch of different currents to choose from in each wattage class compared to meanwell.
They don't have a 200w dimmable to compromise from the hlg185. But there are a lot of smaller options that fit fewer cobs that meanwell lacks. Or some 3590 77v version options.
I am trying to get a few samples, but if anyone wants to beat me to it or needs a special current they have.
http://lsdpower.com/en/pro.asp?ClassID=12
Most of the drivers I have seen in the HLG range are internally adjustable.I'm trying to find a driver to run 4 V29s at 1.4A
I was originally going to run them in series and could use the HLG-240H. There is a high voltage version of this driver but the largest version is HLG-185H-C. It looks like it would be a few volts short. What would happen if I tried to run the 4 vero 29s with that driver?
Assuming it's not possible, are there any alternatives?
Edit: I looked around and apparently there is an HLG-240H-C but it's not listed at Meanwell's US website and apparently not for sale in the US (?)
Can request quote here: http://www.meanwelldirect.co.uk/products/250W-Single-Output-Constant-Current-Dimming-LED-Power-Supply/HLG-240H-CB-Series/default.htm
and here: http://www.sunpower-uk.com/product/250-6W-1400mA-89-179V-IP67-Rated-Constant-Current-Dimmable-LED-Driver/HLG-240H-C1400B/default.htm
I guess I will contact a US distributor and see whether they can be ordered.
Well, that's a very logically question and it solved by the drivers being a CC type not a CV type. Constant Current is what we need since each tiny element of an emitter, hundreds of them, in some cases, with each have it's own voltage at the set current. With a constant current, balanced at the driver, they can all produce a balanced light output. The volts float slightly.Wait, now I'm confused. I'm not electrically inclined and this has been a big learning experience for me. I was thinking that running 4 emitters in parallel would be good because if one of the COBs died the others would continue to shine. But if a COB dies wouldn't that split the voltage between 3 rather than 4, thus putting too many volts through the COBs? Or do the emitters regulate the incoming voltage?