How can I kitbash a half tubelike ceiling light using LEDs that will dissipate for a passenger coach that looks like the one pictured below?
Slide a few clear leds into a section of glass tube and paint the exterior of the glass tube with white paint this should defuse the light.
Just a thought on how I did mine.
If your using leds and not bulbs you can stuff them into fish tank tubeing, just take an led to the pet shop and try different sizes or take the led to a hardware store that sells the clear flexable tubeing but if you use the rubber hose you will have to wrap the tube in white electrical tape to difues the light, DO NOT use Bulbs that heat up in this tubeing it could cause a fire, but leds will not get that hot, Good luck!