It's hard to avoid riding in the dark these days. I got a 2 watt "Blaze" at MEC made by Planet Bike and operate it in flash mode to catch the attention of drivers. Now I'm looking for a supplementary steady light, ideally very bright, and capable of being mounted on the handlebars and helmet. Light and Motion's Stella 200 looks good, though a little pricey (US$250). The Trek Store on Yonge just south of Eglinton sells it for $350. I would be delighted if anyone knows where it sells for less in the Toronto area.
I ride on the roads and well-groomed trails with a road bike and an old ten speed.

I recently got a DiNotte led light (http://bit.ly/3iy5IU) and I'm very happy with it. I got the helmet mount version (which has more mounting options than the handlebar version). It's super bright, good on batteries and easily stowed when not in use.
My $.02 fwiw :)
Rick...