In the pursuit of addressing global challenges related to food security and malnutrition, researchers have delved into innovative solutions. One such solution involves the utilization of microalgae, specifically Spirulina platensis, known for its rapid reproductive cycle and exceptional nutritional qualities. In a ground-breaking study titled “Study of the LEDs spectrums influence on the spirulina platensis growth”, researchers focused on unravelling the impact of different LED Grow lights on the biomass production of Spirulina platensis (blue-green microalgae), shedding light on potential advancements in sustainable food sources.
Spirulina platensis, a cyanobacterium or blue-green microalgae, stands out as a nutritional powerhouse. Packed with proteins, β-carotene, vitamins, phycocyanin, and γ-linolenic acid, this microscopic organism holds promise not only in addressing malnutrition but also finds applications in cosmetics and medicine. With the ongoing challenges of food security and diminishing agricultural resources, Spirulina emerges as a beacon of hope for accessible and highly nutritious food.
The research focused on the impact of different light spectra, ranging from 400 nm to 700 nm, emitted by LEDs on Spirulina platensis growth. LED Grow Lights with their narrow band wavelength and low power consumption, prove to be optimal light sources for cultivating microalgae compared to traditional lights. The study employed LEDs of various colours, including blue, red, yellow, and warm white.
The findings of the study revealed a fascinating sensitivity of Spirulina cells to light spectrum variations. Notably, red LED grow lights exhibited the highest biomass production, while blue LED grow light recorded the lowest. The absorption characteristics of chlorophyll, the primary photosynthetic pigment in microalgae, explain this phenomenon. Yellow LED grow lights demonstrated moderate production, and surprisingly, white LED grow lights displayed a high biomass yield. These results underscore the importance of understanding the nuanced response of algae Spirulina platensis to different wavelengths.
Another aspect explored was the impact of lighting levels on Spirulina growth. Under red Grow light at 660 nm, various light intensities were tested with PPFD ranging from 200 to 700 μmol/m2/s. The results revealed a growth curve corresponding to the microalgae's life cycle, with an optimal lighting level of PPFD (Photosynthetic Photon Flux Density) identified between 300 and 400 μmol/m2/s. Beyond PPFD (Photosynthetic Photon Flux Density) of 500 μmol/m2/s, biomass production decreased, emphasizing the significance of maintaining an optimal lighting environment.
Study of the LEDs spectrums influence on the spirulina platensis growth in batch culture is : available at https://www.researchgate.net/publication/323585539_Study_of_the_LEDs_spectrums_influence_on_the_spirulina_platensis_growth
Read more about how to choose a perfect LED Grow light.