Measured photosynthetic rate at simulated depths in algal raceway ponds
Simulated 20 cm deep ponds of Chlorella vulgaris and Spirulina platensis (0.19 g/l)
Programmable LED array used to reconstruct spectral irradiances at different depths
Photosynthetic rate at simulated depths measured as rate of oxygen production
Top 12 cm of both simulated ponds accounted for over 90% of total pond productivity.