Adding a resistor in series only causes the driver to output a higher voltage to maintain the current.

I suspect you either have a broken driver or have wired the LEDs wrong. If they are actually in series and all are working it is not possible that some of them will light and others not. I expect that the there is a short around the LEDs that are not lighting, and the driver is detecting a low voltage situation and shutting down.

Can you connect something like an automotive light bulb to the output and measure the current?

Bob

 

Adding a resistor in series only causes the driver to output a higher voltage to maintain the current.

I suspect you either have a broken driver or have wired the LEDs wrong. If they are actually in series and all are working it is not possible that some of them will light and others not. I expect that the there is a short around the LEDs that are not lighting, and the driver is detecting a low voltage situation and shutting down.

Can you connect something like an automotive light bulb to the output and measure the current?

Bob

Re: "Adding a resistor in series only causes the driver to output a higher voltage to maintain the current."
Yes, I guess that makes sense.

 

Adding a resistor in series only causes the driver to output a higher voltage to maintain the current.

I suspect you either have a broken driver or have wired the LEDs wrong. If they are actually in series and all are working it is not possible that some of them will light and others not. I expect that the there is a short around the LEDs that are not lighting, and the driver is detecting a low voltage situation and shutting down.

Can you connect something like an automotive light bulb to the output and measure the current?

Bob

Thanks Bob. Unfortunately I don't have an automotive bulb (not sure if there is anything else I could use instead) but I'll double check my wiring. I am new soldering and all things electrical so perhaps I'll start again to be safe. I could certainly use the practice

 

Still no cigar with creating a working LED string. I connected 12 LED's with a combined forward voltage of 36V and again they flashed once, and made a distinct 'tick' sound then went dark. When testing each LED after, both blue LED's were dead. I then reconnected the remaining 10 LED's, which were working individually, tried the driver again and this time there was nothing. No flash, no tick. Again I tested each LED afterwards and this time I found that they were all not working.

Question 1: Does a dimmable driver require that a dimmer be fitted in order to operate correctly?
Question 2: Does it matter that there are red LED's in the string that operate at 2.2V?
Question 3: Can I limit the current from a LED driver with a resistor?

 

Question 3: Can I limit the current from a LED driver with a resistor?

See post #21.

 

It seems that

Can I connect non-dimmable LED's to a dimmable LED driver? I do not intend on using a dimmer. Just a switch.

it seems that there is a universe RGB LED light. It is user-friendly. I just find this via youtube

 

I don't know a whole lot about dimming LEDs, but most dimming circuits work using PWM (pulse width modulation). This powers the LED on and off very quickly, the longer the LED is on for the brighter it appears.

I suspect that the reason they state non-dimmable is because they can be damaged if turned on and off at too higher frequency? Some datasheets state figures like pulse width maximum and duty cycle.

That's my 10 cents worth, all the best with your project