We play early morning, but now as the sun is rising later it's still pitch dark at the tee box. I was prepared this time and bought a Tracer golf ball. It's not mandatory to use a lighted ball, but unless you can stripe one down the middle at the crack of dawn..or actually at the crack of dark..you're screwed.
You will only need to use this Tracer ball for probably the few holes anyhow as they are designed to only go 80% of normal distance and the feedback, from the ball, is rather harsh. It looks and feels like a "Rcok-Flite". It's a ball to just get you through the first few holes of darkness then you can switch to your preferred ball of play.
If you're an early riser and like to get out there before the rooster wakes up, I highly recommend getting one of these balls. It sucks trying to find your ball in the dark and even a crappier feeling if you have to take a drop (..and the possibility of repeating this again and again.) for not finding your ball. Save yourself the heartache/headache.