Ka-50 uses little blue lights placed around the cockpit for night and backlighting for day. I always darken the room when I fly, so it is always night lighting for me.
I purchased some blue LED lamps that are used for customizing cars or what ever, but they each burned out in time and I have to make some new ones. They were wired in parallel.
If you are running a lot of lamps, you need to use a separate larger power source and possibly a relay so your cockpit switch will toggle them.
When are you going to fly?? :)