The LED lights used these days are pretty cheap to run, and you can get cheap usb grow light sets with a built in timer. You just don’t want then anywhere you are looking too often, they are often coloured lights which make your vision go funny when you look at them too long.

I mostly use them for raising summer seeds indoors and growing basil over winter. I wouldn’t go overboard in trying to do an indoor setup, but a small system for a few herbs or seedlings is quite affordable these days.