This is one of those projects that can suck time, money, and fun out of your life - both before and during the enduro. Spend a LOT of time making sure that you get it right, before you get to the track. There always seem to be last-minute ghetto engineered light projects and bad lights WILL cost you time. Advice...
** Figure out a way to mount them quickly during a stop when it gets dark - the best answer is to put the lights on some kind of frame/structure that only goes on one way so they are aimed when they go on. More than a few cars that start with lights mounted will get them busted or mis-aimed before they turn them on.
** Don't fall into the trap of aiming them all over heck's half acre - crossing them or "pointing them at the apex" often turns into "pointing them where they don't do any good." Spend time aiming them individually in real darkness before you get there. Remember that changes in ride height will make adjustments necessary (ask me how I know this).
** Make sure they are firmly mounted - wobbly lights are pretty annoying. But they might be MORE annoying to those you are following than to you, so decide what your priorities are.
** There's no such thing as a real "kit" but do buy GOOD wiring packages and relays to go with your lights. Hella makes particularly nice ones, available separately from lamp assemblies.
** Do some math to know whether your charging system is going to be overtaxed by lights. The formula is Amps = Watts/Volts. If you have 1000W of bulbs burning your charging amperage needs to have some safety margin over 1000/13 = ~77amps. If you have a 50A alternator, you are probably in touble in this example.
** Bulbs make light, lenses and reflectors make visibility - buy good lamp assemblies. Brightness alone won't do it if you aren't putting the light where you need it. Again, years of rallying has made me a Hella fan but there are other quality parts out there.
** More is generally better...
When I saw someone post that we had so much light that we "were dangrous," I figured we had about enough. Ours are on the regular dimmer stalk (pulled + from the high beam circuit to activate the relays) so we can dip them when passing, being passed, or pitting.
See you at VIR - even in the dark.
Kirk