I like my minewt, but mine is really finicky turning on. I also use one of these helmets, that has an integrated lighting system. It also has a mirror available. I got it toward the end of winter, when it was still twilight, and it was enough light by itself. http://www.teamestrogen.com/prodBL_2024007.html

Not sure how dark it is at 5 am, but this might be enough if it's getting light during your ride.