Get one of these two.. you won't regret it guaranteed
http://www.oznium.com/inferno
http://www.oznium.com/inferno-v2
I had an LED underbody kit before, it's an OK kit for the price, that's for sure, but the overall quality just isn't up to par with Oznium at all.
Also the Infernos (even the $220 Inferno V1)
are better than the lightstrike, watch some videos and see for yourself. :] (imo better patterns and so forth)
Basically for the same price as the Lightstrike you could get the Inferno V2, which is bright enough to see on a cloudy day!