With a variety of grow lights, you can produce a lot of plants indoors, including orchids, houseplants and even some vegetables and fruits. Grow lights are essential for seed starting since they help enhance stocky, greening seedlings. A wintertime harvest of salad and herbs greens can also be grown under lights. By understanding how plants use light and about fixture options, you can choose an indoor grow light system along with solar light system that is appropriate for the plants you need to grow.