So I would not say I'm new to lspdfr, Been playing for a few years. But I am honestly stumped with this problem. I downloaded two car seperate car packs, and for some odd reasons the light bars on the top are extremally bright, Now I do have Radiance V installed, but I have honestly never had such a problem. I have tried every key bind combination with "ELS" I tried shutting off the headlights, nothing seems to work. It only becomes this bright only after the car engine starts. Just wondering if someone might have fix for this. These are nice cars, would hate to miss out on using them. And yes I have tried searching on google, the forums, and YouTube. I have not found anything. I might have missed something, but I give up hope. After 3 hours of fiddling around I am honestly stumped. 

take a look into that car's ELS file.

make sure this is set to true:

<Extra11 IsElsControlled="true" />

it also might be worth making sure this is also set true:

<Takedowns AllowUse="true" Mirrored="true" />
        <SceneLights AllowUse="true" IlluminateSidesOnly="true" />

not sure if that second part will help, but they are my settings, and my takedown lights don't turn on automatically anymore. if this doesn't help you like it did me, i apologize