RE: Lexus IS F
I'm assuming this is the HPI body? The light buckets need to be painted, mostly silver (I'd suggest an anodized silver like from Tamiya) then tape them on the inside of the body. Unfortunately, unlike the Tamiya light buckets which are designed to hold leds in them, the HPI body does not come with a nice led holder. The buckets are mostly for scale looks but can easily be adapted to hold leds.