Economically efficient farming of algae is of great interest due to the myriad of low to high value products derivable from algae, such bio-diesel fuel, thickening agents, lipids, pigments, fatty acids, amino acids, proteins, and pharmacologically active compounds. A bottleneck to cost-effective cultivation is the relatively low volumetric productivities obtainable from existing photobioreactor designs, generally less than 1 gram biomass per liter. Factors which limit biomass concentration and volumetric productivity include low light penetration, photo-inhibition, dissolved oxygen accumulation, and CO2 availability. This project is an investigation of algae production using a novel photo-spray reactor which produces an optically thin substrate-light interface and high rate of gas exchange. The project involves the design and fabrication of a bench-scale photobioreactor and testing its productivity using representative green algae and cyanobacteria species. The performance of the photobioreactor is evaluated with respect to biomass volumetric productivity, quantum yield, and light saturation irradiance.