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Increasing the light intensity will boost the speed of photosynthesis. Carbon dioxide concentration. Sometimes photosynthesis is limited by the concentration of carbon dioxide in the air. Even if there is plenty of light, a plant cannot photosynthesise if there is insufficient carbon dioxide.
Full sunlight on a clear summer day has an intensity of about 10,000 foot-candles. A classroom will have an intensity of about 100-foot candles. Photosynthesis and hence rate of plant growth will increase linearly with increases in light intensity from about 100 foot-candles to about 2500 foot candles. A large number of plants are more efficient in use of sunlight and will increase in their rates f photosynthesis up to 10,000 foot-candles.