i've been running some lite glow 7 color led's for a few months now and have not had a problem. I even drove thgough the hurricane in september and have been through several car washes and still no problems.

 

::update::

the LED tubes IMO are better than neon.
don't start yellin at me i havent seen or installed any neons yet.

the multi color kit i purchased from OPTX street glow have a pretty good ouality and look for the price. i think it was super easy to install and to wire. the only thing easier is to wash the windows! i like the LED kits and the multi color kits imo are the way to go. due to the fact if you have 1 color opposig to the seven colors i have with the kit


here are some links.

www.optxbystreetglow.com
or
www.tireflyes.com

the tire flys one is wicked expensive and imo inpractical for a undercar kit. but look at the pics. they're cool. but the price drove me away.

 

nice