You need to check you state laws before you get into this. Most states have some type of law about how many forward facing lights you can have, and how many lights are allowed above the headlights. For instance, Va says you can only have 4 forward facing lights on at any time including, and below the headlights. You cannot have any lights on that are above the headlights while on the highway. In fact, any lights above the headlights are technically supposed to have covers on them so you can't turn them on while on the highway.
I've seen a bunch of pickups get tickets for "illegal" lights on the roll bars.