A bright window is enough, unless you grow during the winter in Scandinavia/Northern America. Don’t use incandescent light bulbs. Use fluorescent lamps, either as light bulbs or as tubes. LED is also good, but it’s not at all necessary to use the red and blue ones that are called “grow lights”. White light is just fine. Make sure you get a 10 W LED lamp, at least, and put it at 15 cm distance. Plants love to get lots of light. Let it be powered on for 12 hours per day.