I am switching from DC to DCC and the instructions for My P2K Gp7 say to change the bulbs to 12 volts/50 milliamps. My LHS has bulbs that are 12 volts/80 milliamps will those work or would they draw too much power?
Depending on the decoder that could be too much. Check with Radio Shack. They have 12v bulbs that draw only 25 milliamps.
Have you bought a decoder for it yet? If not get a Digitrax DH165L0 decoder because it has resistors built into for the lights so you do not need to swap them out. Those bulbs will work BUT they will produce a fair bit of heat. They might melt the plastic body shell and create a lot of unwanted heat under the shell which could effect your decoders life and performance if run for long periods of time. I would go with some LED lights and resistors if you have all ready bought a decoder and stay away from the 12 volt lights.
NCE also makes a drop-in decoder that uses the 1.5 volt bulbs: P2K-SR.
The Digitrax DH165LO has the plug to add a Soundbug, if you are into that.
Both install easily: unplug from the circuit board, remove factory circuit board, plug into decoder, place decoder where old PC board was.
What size LED would You use and with what size resistor? Ho scale, MRC System with MRC decoder