Bright white strip lights
gives a good spread of light, whatever colour you go for.
I have used these in the past with "light my bricks kits" for other Lego models, but now I am building my own these are great as come with adhesive pads already attached so just peel back and stick them to 1x6 Lego plates, and just attach the Lego plates where you need them so you won't have to try and peel them off and try to re-stick them should you want to move them about.
and the best thing about these is you can string them together and use one end to power the strip lights and attach a connecting cable to the other end to power something else.