AN ANALYTICAL METHOD OF LED LIGHTING DESIGN FOR GREENHOUSES WITH PHOTOSYNTHETIC FLUX DENSITY PREDICTION
This paper bases on photosynthetic radiation concepts to propose an analytical method to identify Yield Photon Flux Density (YPFD) needed for proper growth of different plants species and calculate its correlated Yield Photon Flux (YPF) according to certain distance between plant canopy and lighting source. The studies have been applied consider-ing the Humulus lúpulos (Hop) as the object of research under High Flux Chip-On-Board (COB) Light-Emitting Diode (LED) to perform the radiation source for experiments and validation of calculus proposed. The design includes, first-ly, the flux density amount and distance between luminaire and plant to estimate the YPF, which is converted from ra-diant flux. Next, the radiant flux value is approached to compare models of LEDs, which are appropriate for the pro-ject and specify its profiles. In the end, the work shows a comparison based on values extracted from two scenarios: an experiment of a COB LED operating in rated current conditions, while collecting its flux density by a cosine Recep-tor in addition with a spectrometer and, the second scenarios consists in the theoretical data found by equations proposed for the design method.