Daytime Solar Greenhouse Plant Light Spectum Control System

Abstract

The design and model of greenhouse daytime constant light source spectrum from sunlight and RGB LED controlled is present in this title. According to the light color requirement that the special plant need to grow are different in each type of plant. When the requirement of plant are known, we have designed constant frequency spectrum of light in the greenhouse throughout the daytime. The design system is based on solar light which is difference in the color and intensity of light on the daytime. Light frequency adjustment system interferes with the solar spectrum in the greenhouse. The system stops interfering when the optical spectrum is the programed designed wavelength of light. The light spectrum of each color (red, blue and green) measured is normalized to realize the proportion of each color that need to intervene. The example of a plant used in a system test is a cannabis an economic crop in which each pre-harvest period requires a different spectrum ratio color of light. Other variables of plant growth be controlled as well. The sunlight that can pass through the outdoor greenhouse has already been filtered from UV and IR rays. The experimental results show the higher grow rate of the marijuana that plant in the adjust spectrum greenhouse is 12%. We also found that light spectral-optimized cannabis get a number leaf density greater than 30% compare to being grown in an uncontrolled nearby outdoor greenhouse.