<![CDATA[In the process of Spirulina cultivation, environmental factors, particularly light intensity, play a crucial role in influencing its growth. Spirulina production is estimated to be between 3000 and 20,000 tons per year. Spirulina is considered a nutraceutical due to its high nutritional quality (protein, essential amino acids and fatty acids, polysaccharides, carotenoids, vitamins, and iron). The purpose of this study is to determine the effect of different light intensities on the growth rate of Spirulina platensis and to determine the relationship between light intensity and protein content in Spirulina platensis. This research was conducted in the Marine Science laboratory, while protein testing will be done in the Biology laboratory using the Kjeldahl method to determine protein content. The research findings indicate that light intensity significantly affects the growth rate of Spirulina platensis. Light intensity of 3000 lux proved to be the most optimal, resulting in rapid and stable growth without triggering physiological stress, while an intensity of 1000 lux produced slow growth and 6000 lux accelerated initial growth but risked stagnation due to light stress. Treatment with an intensity of 3000 lux yielded the highest protein content of 76%, compared to 1000 lux (65%) and 6000 lux (68%), and variations in light intensity from 1000 to 6000 lux did not significantly affect the yield of Spirulina platensis.]]>
