I have a bhut jolokia that is now going on 7 years old. Each year, I put it outside after last frost. 2-3 months later, I am able to harvest ripe peppers. At the end of the season, I bring it back inside. Typically there are only a couple of developing peppers at this point (maybe 2-3), as flowering and pepper production noticeably slows down towards the end of the season.
Once inside, it is placed near a large bay window, where it gets a fair amount of indirect sun. The last few peppers ripen (usually), but any remaining flowers fall off.
I had always assumed that the duration of sunlight each day triggered flowering, but I've since read that photoperiod supposedly has no effect on peppers.
What causes my plant to start flowering again? Is it possible to get it to flower inside during winter without a full indoor lighting system (i.e. can I use natural winter sunlight, possibly supplemented with one or two LED or other inexpensive grow lights)?