LED 3cd with arduino

Using Arduino LEDs and Multiplexing
1

Hi,
i need a LED very bright. I want to have at least 3cd (= 3 lumen) of luminosity.
Is there any led with this luminosity and which can be powered on by arduino without external supply?

All your advices are welcome :slight_smile:

2

Is there any led with this luminosity and which can be powered on by arduino without external supply?

Without an LED driver no. Without external power supply yes.
Do you know the difference?

3

Lots of LEDs of that brightness here:-
http://uk.farnell.com/jsp/search/browse.jsp?N=2031+202997+110123345+110155375+110305178+110622876+110144758+110622822+110133866+110144707+110454904+110155406+110133933+110133923+110200343+110186462+110455307+110144688+110455229+110454902+110155413+110165915+110133913+110155420+110418187+110455398+110455137+110155421+110455308+110165967+110455062+110155343+110418285+110418068+110191976+110386943+110386106+110386032+110386315+110385454+110385453+110386720+110386824+110386721+110385889+110345760+110386650+110385890+110386370+110385999+110386316+110386002+110386724&Ntk=gensearch&Ntt=LED&Ntx=mode+matchallpartial&No=0&getResults=true&appliedparametrics=true&locale=en_UK&divisionLocale=en_UK&catalogId=&skipManufacturer=false&skipParametricAttributeId=&prevNValues=2031+202997&mm=1002179|110123345|,&filtersHidden=false&appliedHidden=false&autoApply=true&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN%3D2031%2B202997%26Ntk%3Dgensearch%26Ntt%3DLED%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26divisionLocale%3Den_UK%26catalogId%3D%26skipManufacturer%3Dfalse%26skipParametricAttributeId%3D%26prevNValues%3D2031%2B202997

4

Please, Can you explain me the difference?

5

k0ral:
Please, Can you explain me the difference?

Between what?

The arduino's output can only supply 30mA current from its pin. That is not enough for a high powered LED.
A driver will take in a small signal from the arduino and turn it into a large current to light up the LED

6

Grumpy_Mike:
Between what?

The arduino's output can only supply 30mA current from its pin. That is not enough for a high powered LED.
A driver will take in a small signal from the arduino and turn it into a large current to light up the LED

Thank you.Can i have some example of a driver for the LED i need? A link or something similar would be fine. Thanks again!

Just to give me an idea.. if i bought this one:
http://uk.farnell.com/avago-technologies/asmt-qab2-fde0e/led-plcc4-0-5w-amb/dp/1554791RL

which is the driver i need?

I need to know the part list i need to make this led blinking.

7

That LED requires 150mA, which means you need a constant current driver, here is a list that should do the job:-

Constant current drivers

However you can make your own constant current drivers, like this:-

Constant Current.png
Constant Current.png601×513 6.52 KB