Étude comparative intergénérationnelle de luminaires horticoles

Abstract

The optimization of plant growth in a closed environment is in development. All the growth parameters are now optimized, such as humidity, nutrient control, etc. On the other hand, the lighting optimization, up to the arrival of the LEDs has remained stagnant. LED has opened the last parameter to optimize. It is noted that in recent years the research on the spectral influence on the plants is accelerating. These researches have seen the emergence of a multitude of new technologies on the market. Do these new technologies outperform their predecessor? This project is designed to compare three different generation lighting systems: horticultural fluorescent tubes, white LED, and a multi-LED light fixture that reproduces the sun. These have been tested in two aspects, namely the quality of the spectrum emitted and the growth of plants. The plants tested are basil (Ocimum basilicum), mint (Mentha arvensis), coriander (Coriandrum sativum), leaf lettuce (Lactuca sattva) and chives. The tests occurred in 3 consecutive experiments of a period of 33 days. The qualification criteria for spectral quality are based on ASTM E927-10. The tests are designed to compare the spectral quality, the field of view, the spectral uniformity and the temporal stability. For growth, the size of the plant and leaves as well as the diameter of the stem were analyzed. The results obtained demonstrate that at the spectral level the multi-LED lighting system offers a spectral quality well in front of its predecessors. In terms of growth experimentation, the multi-LED offers better results than the other two technologies. This research validated the technological advances and that a broad-spectrum multi-LED lighting gives superior results compared to the latest generation of white LEDs.

Date	15 May 2018
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Sylvain G. Cloutier (Supervisor)