I used Christmas tree decoration lights leds colored and white.
a green jewel and a blue jewel,
and the first one is white led behind the two in a black tube,
the greener one is a blue led behind the two plastic jewels.
really cheap leds off the strands for Christmas trees,
use a 470 0hm resister for a 9 volt battery or power in- 9 volt 500 millamps.
a cell phone charger cord should work well. just cut off the phone end plug.
use the resistor on the first led in from the power source.
as I build my stx enterprise I will show pics of all this stuff.