Hey Ludo, about 18 years ago I participated in a 24h slot race as mechanic for the 'young' team. The more experienced guys helped me out with the lighting (no lights on the track at night), and I'm happy to pass on to you what I remember.
Leds were far from as strong in those days a now, but the track provides the current , so no batteries were needed and we had 12 volt. To make sure we not only lighted the car but also could see the track we used small reflectors: cone shaped holders with chrome plating at the inside. This really helped a lot.
We had 2 sets in the front, wired in parallel and 2 red leds in the back that would light up when you brake. The parallel wiring was to prevent sudden death: total blackout on failure of just one LED.
On top of that we had all the lighting built onto the body; with another body for daytime use. Actually I think we had 2 daytime bodies and 3 night bodies. So in case of failure of the lights we just swapped them out and had plenty time to repair if possible.
I hope these tips help
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