A plant that grew well in an eastern exposure in the summer may require a southern exposure in the winter. Move plants to other locations seasonally if needed. Plants utilize all colors in photosynthesis. An incandescent light bulb emits limited colors and is not acceptable as an indoor lighting source for plants. To grow plants under artificial fluorescent light, most indoor gardeners combine a cool and warm tube in a fixture to provide light of good quality for many interior plants.
Duration refers to the length of light exposure.
A daily exposure to light, preferably 8 to 16 hours, is needed for plant processes. Air temperature is quite variable within a home or office and can change daily or seasonally. Avoid locating plants on cold window sills, or where there are cold or hot drafts from opening doors and heating or air conditioning vents. Excessively high temperatures cause yellowish green foliage which may have brown, dry edges or tips and spindly growth. Insect, mite and disease problems may develop quickly under warm conditions as well.