Different resistor for LEDs

irvmuller

Member
I’m wanting my leds to be a bit less bright. I know using resistors with greater resistance can do that. How high could I go and still get the led to still come on? What do you guys use or suggest besides the standard 4.7k?
 

Mcknib

Well-known member
I like mine dim for standard LEDs I use 10K or you could if you can he bothered use a 20K trimmer wired as a variable resistor and set it to your preferred brightness them measure the resistance for future reference

If you use a trimmer make sure it's not set to zero resistance, set it around half way so you don't blow yer LED when you connect it
 

Chuck D. Bones

Well-known member
I’m wanting my leds to be a bit less bright. I know using resistors with greater resistance can do that. How high could I go and still get the led to still come on? What do you guys use or suggest besides the standard 4.7k?

Your best bet is to stick them in a breadboard, try different resistors and see for yourself. Different colors, standard vs. super-bright, all have different resistor requirements. I have 400nm UV LEDs that need 1.5K to be seen. My aqua LEDs are a plenty bright with 15K - 22K. There are no absolutes.

IF YOU USE A TRIMMER, PUT AT LEAST 1K IN SERIES TO PROTECT THE LED.
 

spi

Well-known member
I breadboard the LED with a pot attached, and adjust to my desired brightness, then choose the closest resistor to where the pot is. If you do this, put a 2k in series with the pot so you don't accidentally burn the LED.

I usually end up with 10~20K for regular LEDs and ~50K or even more superbrights.
 
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