Evaluation index of lighting performance in multi-span greenhouse

Lighting performance in greenhouse is crucial for heat gain and Photosynthetically Active Radiation (PAR) density for crop photosynthesis in greenhouse. At present, China lacks a series of the harmonious and standardized indices to evaluate lighting performance in greenhouse. On the basis of analyzing current research achievements, total solar radiation transmittance, PAR, uniformity of illuminance were suggested to determine lighting performance in multi-span greenhouse.