I personally don't use a light cycle, and my snakes breed just fine, though I know a number of people that do claim it does some good.

Their native habitat is right on the equator so their natural light cycle is 12 hours on and 12 hours off every day of the year. With a half an hour of twilight on either end of the day, you would get around 13 hours of usable light. So, 13 hours on and 11 hours off would be natural for them. 14/10 should work just fine too.

Mark