I dunno, the sun comes up at 5 am and goes down after 9 pm; there's light in the sky until 10:30 pm. I keep a set of ultralight LEDs on my non-commuting road bike, for when I go through a tunnel or whatever ... but lighting isn't really a problem this time of year.
That said, wheel lights are cool, and I'm convinced they help drivers who are about to join your path from a side road see you before they pull out through your line.