feed a pizo crystal into the base of a transistor...light up a light emitting diode when the crystal vibrates...mount the crystal on the inside of the drum shell and use a potentiometer to adjust the sensitivity(between the crystal and the base).
Understanding electronics is a real handy skill as a drummer...basic text book can get you pretty far.
I use a different type of lighting.It's called EL wire.It comes as a finished product.You need a sequencer & the wires.The kind I have now is a sound sensitive sequencer.When I strike the drumset,the drums light up & goes off individually.EL wire doesn't emit heat & looks like neon.
I picked up 2 15 ft multi color led strips, and a sound activated controller with power supply. It isn't specifically for the drums, but could be adapted. They have multiple modes that can be set with an IR remote. The controller also has a sensitivity adjustment knob. We use them as back lights when we play with each strip wrapping around the back and sides of the stage. The total setup cost about $50 on Amazon.