Tetraselmis sp. and Nannochloropsis sp. are common marine microalgae used as substrates for production
of biodiesel which is the third generation alternative energy. Recently, wavelength of light is believed to
influence the growth of marine microalgae. In this investigation, two different types of light wavelength;
red and blue which can influence the production of microalgae were investigated. The marine microalgae
growths were observed in terms of biomass which was then measured using the UV-vis
spectrophotometer. The results showed that both Tetraselmis sp. and Nannochloropsis sp. grow better in
the blue light compared to the red light indicated by the higher absorbance readings.