Why did I issue this man a traffic citation? See inside...

Man was traveling down a state highway in an old pickup truck. I passed him on the other side of the road. I did a u-turn and pulled him over. I asked to see his drivers license and proof of insurance. This, he gave me. Driver then asked, “why did you stop me?”. I said, “because you have no headlights on your truck”. This was in the early afternoon and the sun was shining. Driver then stated, “it’s not night time and I do not need headlights to drive in the daytime. I never drive this truck at night”.
I issued him a moving traffic citation for driving a vehicle with no headlights”. Question: in your opinion was issuing this truck driver a traffic citation justified? If yes, explain. If no, explain.