Resistor Values for LED's

[billstein]

Hi all. Just a quick question. What resistor values do you use for Led's.
1. For diffused?
2. For waterclear?

Thank you

[cooder]

I use 10K for water clear high brightness LEDs. Works good for me.

[alanp]

For 9V? 4K7 for normal.

Swearing for different.

[cooder]

For 9V? 4K7 for normal.

Swearing for different.

Well 10 K is  a little less bright than 4k7 but still enough to light up my music room when my board is powered up.... just not too retina scorching.

[Mich P]

Diffused      :     1 to 4.7K
Waterclear  :  15 to 100K
Mich P.

[HKimball]

Wow that explains a lot - I just use 4.7k for everything haha. Makes sense now why my white LEDs on my 18v pedals are like staring into the sun

[muddyfox]

yeah I'm with Mich. All over the place, depending on the application.

[jimilee]

I use 10K for water clear high brightness LEDs. Works good for me.

Great to know! I've never even thought about it, just complained to myself.


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[davent]

I have a lot of random LED's (sorted by colour) from many different suppliers, diffused/clear, three sizes etc., i check each one before installing to get the appropriate clr and that has ranged from ~500r to 47k. Have a box with 24 steps  from 500r to 18k to test for a clr value.

[billstein]

I have a lot of random LED's (sorted by colour) from many different suppliers, diffused/clear, three sizes etc., i check each one before installing to get the appropriate clr and that has ranged from ~500r to 47k. Have a box with 24 steps  from 500r to 18k to test for a clr value.

That's a great idea.
Is that resistor on the left a safeguard so you don't apply to much voltage and burn out the LED?
Is that a 1x12 rotary switch?

[pickdropper]

Usually between 1k and 5k for diffused and between 15k and 20k for ultraclear.

[davent]

I have a lot of random LED's (sorted by colour) from many different suppliers, diffused/clear, three sizes etc., i check each one before installing to get the appropriate clr and that has ranged from ~500r to 47k. Have a box with 24 steps  from 500r to 18k to test for a clr value.

...

That's a great idea.
Is that resistor on the left a safeguard so you don't apply to much voltage and burn out the LED?
Is that a 1x12 rotary switch?

That's just a 10k that gets added in series with other 12 resisitors  so you get the next 12 higher steps.

Have an amp with  a bicolour led that needed a quite different clr for each colour to achieve equal levels of brightness, there is no one size fits all.

[billstein]

Thanks guys.

I always use 4k7 for diffused but tried a waterclear blue with 4k7 and now I think I need to replace the retina in my eye!
So, just wanted to know if there was a consensus out there for the high brightness LED's. I'm hearing anywhere from 10K all the way to 100K.
I might have to build a tester like davent.

[guile]

I have a lot of random LED's (sorted by colour) from many different suppliers, diffused/clear, three sizes etc., i check each one before installing to get the appropriate clr and that has ranged from ~500r to 47k. Have a box with 24 steps  from 500r to 18k to test for a clr value.

That's a great idea.
Is that resistor on the left a safeguard so you don't apply to much voltage and burn out the LED?
Is that a 1x12 rotary switch?

Completely OT: wheredid you find that LED-tester? Would love to have one

[davent]

Just a bunch of random bits gathering dust thrown together into something useful. Idea was put forward by Mark Hammer over at diysb.
dave