Fig. 3
From: Comparison of four outdoor pilot-scale photobioreactors
Influence of daily photon flux density on photosynthetic efficiencies on sunlight for the different photobioreactors. For the horizontal tubular photobioreactor (HT), open raceway pond (ORP), vertical tubular photobioreactor (VT) and flat panel photobioreactor (FP). The different colors of the squares indicate different dilution rates applied to each different photobioreactor