Anybody tried the ELG version of Meanwells, Rather than HLG...

nfhiggs

nfhiggs

Well-Known Member
NothinYet said:
So a strip will only pull as much current as the max volts of the chip or the driver with 1 hooked up to a CV driver?
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No, the current depends entirely on the voltage applied (and temperature). If you apply 24 volts (to a Samsung F strip) it will pull almost 1 amp of current. It does not matter what's in parallel with it. One strip or ten strips, as long as the voltage does not change, then the current does not change (assuming heat is properly dissipated)

NothinYet said:
If you look at the spec sheets the constant voltage drivers have a range of voltage they run at. Example a 42 V driver may be able to run between 38-45v depending how many amps that driver puts out, and the wattage the driver is rated for.
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No, they have range of voltage they can be adjusted to - its not load dependent. Once the voltage is set it stays CONSTANT - hence the name "constant voltage" driver. Only when you load it up to its current limit does it become "constant current", and even then the voltage will not go above the setpoint.
 
nfhiggs

nfhiggs

Well-Known Member
Airwalker16 said:
So what does the 36/42/48/54 numbers represent in line with cobs and how any on each type of drivdriver?
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I'm not quite sure what you are asking here - the numbers represent the drivers output voltage (adjustable across a 10% range, typically). 36V COBs would be used with a 36V CV driver. The number of COB's would depend on the drivers current capacity and your desired current per COB. If the driver is rated for 6 amps, then you could run 6 cobs at 1 amp each (or less), or you could run 12 COB's at 500 mA each.
 
Airwalker16

Airwalker16

Well-Known Member
nfhiggs said:
I'm not quite sure what you are asking here - the numbers represent the drivers output voltage (adjustable across a 10% range, typically). 36V COBs would be used with a 36V CV driver. The number of COB's would depend on the drivers current capacity and your desired current per COB. If the driver is rated for 6 amps, then you could run 6 cobs at 1 amp each (or less), or you could run 12 COB's at 500 mA each.
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So the number on the end of the driver model you'd wanna match as close to the fV of the cobs or boards you're using?
 
Rocket Soul

Rocket Soul

Well-Known Member
Airwalker16 said:
So the number on the end of the driver model you'd wanna match as close to the fV of the cobs or boards you're using?
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Yes, the hlgxxx-48A for example would be a 48V drivrr, the data sheet would tell you how much you can adjust it up and down. Set the voltage to the amount that corresponds to the amps you want to pull per strip/chip.
 
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NothinYet

Active Member
nfhiggs said:
No, the current depends entirely on the voltage applied (and temperature). If you apply 24 volts (to a Samsung F strip) it will pull almost 1 amp of current. It does not matter what's in parallel with it. One strip or ten strips, as long as the voltage does not change, then the current does not change (assuming heat is properly dissipated)


No, they have range of voltage they can be adjusted to - its not load dependent. Once the voltage is set it stays CONSTANT - hence the name "constant voltage" driver. Only when you load it up to its current limit does it become "constant current", and even then the voltage will not go above the setpoint.
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Ok, this is understandable for the a version of driver. You cannot set the voltage on the B or regular version. How would it work in my example with the number of strips not maxed out?
 
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dbrn32

Active Member
I can’t speak for the cv versions, but on the cc the 120v derating is on output current. Current is around 75% on low voltage input.
 
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dbrn32

Active Member
ANC said:
P=VI
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Thanks for that lol. Can you point to the data sheet where it says if I need to account for a 25% reduction on voltage to make sure my leds clear cc region, or I need to plan on a 25% reduction in current?
 
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dbrn32

Active Member
ANC said:
I also think the reduction will be in the max current output.
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It is, like I said on at least the constant current models. I had printed off some data sheets when they were released and it wasn’t clear. But grabbing current sheet listed on trc’s page the derating chart is labeled better than the one I had.
 
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boybelue

Well-Known Member
nfhiggs said:
No, that is not correct. It does not work that way - not with CV drivers. The 24v emitter will only draw current according to its VI curve. F-strips for example, at 24.0 volts will pull about 950 mA, and at 25.2 volts they will draw 1.8 amps. The only way for it to draw 10.3 amps is for the voltage to rise considerably - upwards of 30 volts.
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This im not understanding. The driver is putting out 10 amps at 24 volts so are you saying the chip will only accept so much current at 24v no matter if the driver is putting out more at 24v, say a 100amps at 24v? Can only be overdriven by voltage not current? Or current alone?
 
Rocket Soul

Rocket Soul

Well-Known Member
boybelue said:
This im not understanding. The driver is putting out 10 amps at 24 volts so are you saying the chip will only accept so much current at 24v no matter if the driver is putting out more at 24v, say a 100amps at 24v? Can only be overdriven by voltage not current? Or current alone?
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Nfhiggs is not withbus any more - rip

What he says is that as youy feed a chip more current its voltage will go up, if you cannot raise the voltage of your input current the chip will simply not take more current.
The most usefull application of this (i think) is hlg a-type drivers for parallel: you can adjust the voltage down so that even if one chip fails the other chips wont take that excess current as it cant go above its voltage
 
Airwalker16

Airwalker16

Well-Known Member
boybelue said:
This im not understanding. The driver is putting out 10 amps at 24 volts so are you saying the chip will only accept so much current at 24v no matter if the driver is putting out more at 24v, say a 100amps at 24v? Can only be overdriven by voltage not current? Or current alone?
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Unfortunately, nf has passed away. You won't get a reply.
 
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boybelue

Well-Known Member
Wouldnt you still have to divy up the current? You cant simply place one cob on said driver with a set voltage of 24v without overdriving the chip?
 
Rocket Soul

Rocket Soul

Well-Known Member
If you have a driver that gives exactly 24V and 10 amps then if you connect a chip that takes 1 amp at exactly 24 v and you connect it: the chip will take one amp, it cant push 10 amps thru at that voltage. With a A-type menawell you can change this up a down slightly.

Afaik
 
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