Can anyone tell me what the resistance value would want to be if I was to use this LED type, and run 12vdc through it? If I was to run more than one LED in parallel, how would this affect the resistance value?

 

All help appreciated :bow:

 

Edit, also how could I run some LED's, on a separate run, brighter then others on another run?

 

From my calculation, ie 12V supply and not wanting more than 25mA current then you would need 480 Ohm resistor (or the closest available, can't remember what they are available in.) For brighter LED's in a different run then use a smaller resistor but from the table I would assume you would burn them out so that means in the brighter run you would need the 480 Ohm and in dimmer runs you would just use bigger resistors. HTH, I think I have got it right but will stand corrected.

Cheers bud :bow:

 

Would I need a separate resistor for each LED?

Cheers bud :bow:

 

Would I need a separate resistor for each LED?

 

I beleve you can use one resistor per LED for the bright ones, and one resistor and the dim LEDs in parrelel :)

Cheers Mat

Cheers bud :bow:

 

Would I need a separate resistor for each LED?

 

I think it depends on if you put them in series or parallel. If you put a resistor in series with each LED then you will reduce the current and hence the brightness even more.

I would have draw a circuit diagram, if you tell me what you want I could try and work something out.

Try here

 

[Edit] Or here for multiple LEDs

A 470 ohm resistor would be the closest. You could put 2 LED's in series and use a 330 ohm resistor.