Hi Boj,
I think that would depend on how the lights are moulded on this kit. If you can paint the insides...ie the chrome reflectors etc then this certainly does add to the realism on the finished model. Having made a full working set for a 1/10th Nissan Skyline R34 GTR (The one you can see as my avatar pic), it certainly does look the part.
Have a look at the pics on this link, the lights have been done on this one.
Mitsubishi Evo VI (1/24 Tamiya)
Regards.......Mark