Light reflection increase?

Hopefully i created this in the right area of the forums.

Issue: I’ve seen on quite a few servers a couple police vehicles actually reflect their blue or red lights off of walls/objects when activated.
I installed a boatload of vehicles in my server and i can not find one that reflects? Is there anyway to edit some files in the data folder of the resource that I can increase my light radiance?
I do have radiance V installed. I am not using ELS at this time due to it being extremely buggy. Although many thanks to the developer who created it and I mean no disrespect.\

Edit: Just to clarify, i need something server side.