Remember, the light that comes in windows changes with the seasons. You may need to move some plants away from the strong sunlight that pours in through south-facing windows in the summer. However, in the fall and winter this south window may be ideal. Learn to recognize the signs of light stress and know the requirements of each plant. If the light available is less than ideal, artificial light should be considered.
Incandescent bulbs produce too much heat to be used with plants.
Special grow lights are the best choice, especially for blooming houseplants. If artificial light is the main or only source of light for plants, the lamps should be lit 12 to 14 hours per day and be 6 to 12 inches from plants. Blooming plants will require up to 16 hours and should be no more than 4-6 inches away from lights. Most foliage houseplants grow best between 70 to 80 degrees F during the daytime, and 60 to 68 degrees F at night. Most flowering houseplants grow well with the same daytime temperatures, but at night a temperature of 55 to 60 degrees F is better.