Depends on the LED luminisity and intensity. I got led's INSIDE the car, and when looked at, those shits blind the FUDGE outta me, but only for a shorter distance... AND, it's not as even as a neon. LED"s are like "spot lights"
But, just a warning, those underbody shiz... They blow out after like 8 months of use. I went through two sets already. The tubes either crack or they just stop for some reason~