In-efficient absorption of light can hamper photosynthesis.Microalgae can only grow under high enough light intensity.The level of high intensity is species specific. For example,the light saturation point is 185 mmol/m2/s for Phaeidactylum cruentum, 200mmol/m2/s for Porphyridium cruentum, and 150 mmol/m2/s for Aphanothece microscopia. Sharma
et al.found three times more growth rate at 50 mmol/m2/s as compared to20 mmol/m2/s