Arduino Forum

Using Arduino => LEDs and Multiplexing => Topic started by: artursm15 on Dec 11, 2016, 07:19 pm

Title: 12v vs 24v for 3w power led !
Post by: artursm15 on Dec 11, 2016, 07:19 pm
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 ?
Title: Re: 12v vs 24v for 3w power led !
Post by: PaulRB on Dec 11, 2016, 10:17 pm
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.
Title: Re: 12v vs 24v for 3w power led !
Post by: CrossRoads on Dec 11, 2016, 10:36 pm
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 (https://www.sparkfun.com/products/13705)
Title: Re: 12v vs 24v for 3w power led !
Post by: artursm15 on Dec 12, 2016, 12:09 pm
power supply (http://www.ebay.co.uk/itm/251282689468?_trksid=p2057872.m2749.l2649&var=550300721283&ssPageName=STRK%3AMEBIDX%3AIT)

this is power supply and these are leds..

Leds (https://www.aliexpress.com/item/50pcs-1W-3W-High-Power-white-warm-white-red-green-Blue-Royal-blue-660nm-LED-with/32708134061.html?spm=2114.13010608.0.0.RpAllX)
Title: Re: 12v vs 24v for 3w power led !
Post by: PaulRB on Dec 12, 2016, 11:30 pm
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.