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Topic: 12v vs 24v for 3w power led ! (Read 996 times) previous topic - next topic

artursm15

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 ?

PaulRB

#1
Dec 11, 2016, 10:17 pm Last Edit: Dec 11, 2016, 10:19 pm by 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

#2
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
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

artursm15

#3
Dec 12, 2016, 12:09 pm Last Edit: Dec 12, 2016, 12:57 pm by artursm15
power supply

this is power supply and these are leds..

Leds

PaulRB

#4
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.
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