Quote Originally Posted by LEDave View Post

So I'm thinking at 5v with 75ma a 60 ohm resistor on pin 15, pin 16 ground should do it.

I always thought LED's worked on about 25ma, must be a big LED inside then?

Dave
It may have one big LED, or several smaller ones in parallel.
I have some Lumex displays that are rated for up to 160mA. But they are viciously bright at that level and I rarely run them at more than 50mA.
For dim lighting conditions, I may run them at 20mA..

I'd start with about 1/2 current and see how it goes. No need to run them any harder than necessary. If you've got 100 ohms, or 200 even, give it a go.

Don't forget that resistor wattage... a 60 ohm resistor @ 75mA = 0.3375 watts dissipated.

Steve