Quote Originally Posted by Christopher4187 View Post
...Another thing that doesn't make sense is the non-linear curve in current when adding diodes onto the PCB. One LED consumes 30mA but two doesn't equal 60.
I have a similar problem. I'm designing panels for my residential alarm system and I'm kinda overwhelmed by the possible maximum current. A LOT of LEDs could potentially be on at the same time (I'm using solid strand 24 AWG telephone wire with 12V 7Ah battery backup).

I started with LCDs, but these panels are not only for the house where it's warm, it's also for the garage (worried about cold and humidity).

Robert