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# Yet another LED Driver question? Answered

Fellow instructa-people,

I have aquired a couple of 20w LED Drivers, which are mains powered.

They are branded "Inples 100", each one has 6 outputs at 10.5v

I am looking to use 3w LEDs with the driver, but I'm having problems finding how many leds I can use on each channel.

The forward voltage of the LEDs range from 3.2 - 4.0v (as per datasheet).

Can any kind soul point me in the right direction on how to work this out?

Hope this makes sense, kinda new to using LEDs..... can't you tell??

Regards

Nabis

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Nice picture, 10.5 volt @ 2.5 amps DC SUPPLY capable of running on any AC power from 100 to 240 VAC main 50 or 60 Hz...

Still no idea about which out put does what...

You need to put some resistive load on it and try to get some measurement to figure it out. Another picture of the red side text could help..

Thanks for the replies folks. Much appreciated.

From what I have been able to find on 'tinterweb, the proper LED modules that designed for the driver have a couple of resistors in series.

As requested, image of said driver.

I am not sure if the compliance voltage (maximum open circuit voltage) is 10.5V or if the output is CV mode. A proper LED driver _should be_ constant current output, which means the output voltage will vary over some range (0 to 10.5V?) in the attempt to maintain a constant current.

If it is like that, then you need 3 or less LEDs in series with each output. If it is constant 10.5V regardless of load, then you need up to 3 LEDs with a resistor in series to limit current. The value of the resistor depends on how much current you want to drive the LEDs with.

I reason that three in series based on voltage ... or six = one per output.

What country is the driver