I machined aluminum holders for the overhead reading and map LED light assemblies. They were machined out of 1" bar stock. The interior lights will be mounted in 1" holes in the overhead over each seating position and a red and white aimed at the IP. Each will be individually switched and dimable.
I have; 4 reading spots (8 degree optics) over each seat 2 inst lights, one white one red (40 x 18 degree oval optics) 2 red tail beacon (140 degree optics, as wide as I could get without sticking out)
LED light holders
reading, red/white instrument and red strobe LED lights