12v vs 24v for 3w power led !

[artursm15]

Hello guys just another newbie question .. so im new with all this suff and i want to make dimmable power leds  so i ordered some power supply from ebay but they ofc like allways send the wrong one to me istead of 12v they send me 24v power supply. so my plan was i would somehow use some kind of mosfet with potmeter and this driver to run my 3w leds and make then dimmable so im wondering is there big differnece if i use 24v or 12v ..!

power supply is
180-240V
24V
3.3A
80W
its says thats its Dimmable via low voltage LED Dimmer .. what that mean ?

[PaulRB]

With a 12V supply you would probably wire 3 leds in series. With a 24V supply you would wire 6 leds in series, maybe 7.

Post a link to the power supply you received, and the leds you plan to use, and we will check.

[CrossRoads]

Yes, post the LEDs. 3W LEDs are likely to need a current controlled driver, and not just a simple resistor.
A LED driver like what's found on this board
https://www.sparkfun.com/products/13705

[artursm15]

power supply

this is power supply and these are leds..

Leds

[PaulRB]

I don't think that power supply is suitable for those leds. The power supply is constant voltage. It is suitable for 12V led strips. Those leds need a constant current power supply.