Photobioreators are used for investigating photosynthesis-based processes. In photosynthesis cellular growth receives required energy from a light source and during light dark cycles growth takes place. Photobioreactor with 1.5 L of capacity is illuminated from the outside using an array of LEDs. Different light colors and their effects on cell growth could be investigated. Aeration and mixing is provided in the vessel with adjustable mixer rotation. The unit includes sampling port and other parameters associated with growth such as pH, temperature, and dissolved oxygen can be measured. Light dark cycles and light intensity can be adjusted upon the color of light source.