Got some lighting kits

Surprisingly there is no issue with uniformity of light, I think its because the light shines into the end of the acrylic insert and it sort of acts like fiber optics do.  Then the light diffuses down (and up on a bi-level car) through the acrylic strip.  It's quite an elegant solution in my opinion, best I've seen on any lighting kits so far and you can get kits with different light temperature LED's.  So you can have a florescent type LED or a warm white LED, both versions ship with little clip on orange filters as well so you can warm the light temperature even more.  So depending on the era of the car model you can fit an appropriate type of LED and if necessary filter to make them look more realistic.

I'll be fitting the kits I got to some cars over the weekend so will take some pics for example of the acrylic insert fitted into the roof of a car and of them lit so you can see the effects for yourself