I had my first ride of the year this evening along the Ottawa River.  Just a short ride to the War Museum and back because it was getting late.  Though I have both a tail light and a head light, none of the other cyclists I encountered on either the path or the roads, except one, had any lights or reflectors.

HTA 62(17) – Lights

a bike must have a white front light and a red rear light or reflector if you ride between 1/2 hour before sunset and 1/2 hour after sunrise and white reflective tape on the front forks and red reflective tape on rear forks.  Set fine: $20.00

That’s taken from the MTO’s Cycling Skills website.

It’s not like lights are expensive.  You can pick up tiny white and red LED lights from Mountain Equipment Co-op for under $4/each, so there’s really no excuse for cyclists not having lights if they’re going riding at night.