Lighting Configuration and High Pressure Sodium (HPS) Lamps
The number and position of the lamps were determined using a specialized lighting configuration computer program.
The photo below shows a high pressure sodium (HPS) luminaire used for supplemental lighting. These lamps provide the recommended Photosynthetically Active Radiation (PAR) needed to supplement natural light. The computer control program measures the solar irradiance at the plant canopy surface and adjusts (on and off) the supplementary lighting system to achieve a pre-determined total light level each day. For the spinach production the recommended level is 15 mol m-2d-1.
