First, never be afraid to post a question, even if it has been asked many times before. You don't know if it has been asked before or not. I assure you some others don't know the answer but may be afraid to ask so you are doing them a favor. And mostly, if only new, fresh, never-before-asked questions were allowed, this forum would die a very quick death. The questions are what keeps it going.
You do not need a lot of light to keep them laying. If you have decent eyes and can read a newspaper by the light, it is enough. No need to pay for more kilowatt hours than you need, so use a smaller bulb.
If you have a well ventilated coop where they roost out of the drafts, you really don't need to add heat in the winter unless you are getting days well below zero Fahrenheit. You can get ventilation without drafts on their roosting area by having the ventilation holes above their roosting area. Something at a lower level that can be opened in the summer and closed in the winter is also a good idea. I'll give you links to a couple of articles on this that might help.
Pats Winter Coop Temperatures
https://www.backyardchickens.com/web/viewblog.php?id=1642-winter-coop-temperatures
Pats Ventilation
https://www.backyardchickens.com/web/viewblog.php?id=1642-VENTILATION
One problem you might have is water freezing in the winter. Since you have electricity in the coop, you can make a heated waterer. You can use the search feature up in the blue line to help with ideas or start another post on that. I found that a black rubber water dish I got from
Tractor Supply keeps the water thawed pretty well when set in the sun and if it froze overnight, I just turned it over and stomped the ice out before I refilled it. That might not work in your set-up.
Good Luck!!!