I have noticed that slowly raising the track voltage the LED's on Fastrack switches illuminate pretty brightly well before the track voltage gets up to 18 volts.
I would like to get some LED's for a control panel that will work in conjunction with a toggle switch that turns power on/off on a siding. I have found some nice panel mounted green LED's that are rated for 24vac. Using 18 volts for the track (DCS and Legacy), will the 18 volts be sufficient to illuminate the panel LED's (kind of like lower voltage illumination I see on Fastrack switches)?
The panel LED's that I have found tend to be available for 12vac or 24vac. If the 24 volt LED's won't be bright enough, I would think I could put the 12 volt LED's in series with a resistor to work with 18 volts. If I did that, what resistance and power rating would I need for the resistors?