Well go by watts. 55 are most states legal. Anything above that must be covered while on the road. Off road you can load it up 120 watts makes a lot of light. Just make sure you got either a good battery or high output Alternator to run everything, especially if you have a winch. 4 120 watts lights onthe windshield are an awesome combo. But any extra light is worth the $$$. I have four Hella 500 ff's on the front of my TJ with the outter two pointed out 10 degrees gives me a full sweep of light.