Other factors such as curtains, trees outside the window, weather, season of the year, shade from other buildings and window cleanliness also effect light intensity. A southern exposure is the warmest, eastern and western are less warm, and a northern exposure is the coolest.
Eastern and western exposures receive about 60 percent of the intensity of southern exposures, while northern exposures receive 20 percent of the intensity of a southern exposure. Southern exposures have the most intense light. Window direction in a home or office affects the intensity of natural sunlight that plants receive. Light intensity rapidly decreases as the distance from the light source increases. The light intensity received by an indoor plant depends upon the nearness of the light source to the plant. Plants can be classified according to their light needs, such as high, medium and low light requirements. A similar plant grown in very bright light tends to be shorter, better branches, and have larger, dark green leaves. Generally speaking, plants grown in low light tend to be spindly with light green leaves. Light intensity influences the manufacture of plant food, stem length, leaf color and flowering. When determining the effect of light on plant growth there are three areas to consider: intensity, duration and quality. Light energy is used in photosynthesis, the plant’s most basic metabolic process.
The rate of growth and length of time a plant remains active is dependent on the amount of light it receives. Light is an essential factor in maintaining plants.
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