1. Introduction
DAS consist of the DLI (Daily Light Integral), sensors, database, control unit, DALI and tree important data light intensity, light quality and light duration. For plant growth
•DAS algorithm to determine the necessary light values for the growth of plants where the natural light is insufficient for use in greenhouses
•To ensure that an optimum level of control of plant growth and LED armature
•Plant development or strengthening of manipulating the amount and spectral properties of the light for the lack / need situation or scenario defined in line with defined wavelength resolution, and techniques for the development of technologies to be checked
Using LEDs as a lighting source, it is possible not only to optimize the spectral quality for various plants and different physiological processes, but also to create a digitally controlled and energy efficient lighting system [1, 2]
Plants require light throughout their whole life-span from germination to flower and seed production. Three parameters of grow light used in greenhouse industries are relevant: quality, intensity and duration. All three parameters have different effects on plant performance [3]
Plants do not absorb all wavelengths of light (solar radiation), they are very selective in absorbing the proper wavelength according to their requirements. The most important part of the light spectrum is 400 to 700 nm which is known as photosynthetically active radiation (PAR), this spectral range corresponds to more or less the visible spectrum of the human eye [4].
Plants are exposed to a variety of spectral qualities governed by geographical location, seasonality, changes in cloud patterns, and effects of surrounding vegetation. Additionally, plants under greenhouse cultivation in areas where natural light is not sufficient to grow a productive crop are exposed to significant changes in spectral quality caused by supplemental lighting with spectra dissimilar to natural light (Hogewoning, 2010). Plant responses to the light spectrum can be generally classified in two major aspects: growth responses and photomorphogenic responses. The growth responses are governed by the photosynthetically active radiation composed of wavelengths between 400-700 nm. The photomorphogenic responses are generally triggered by the blue (400-500 nm), UV (250-380 nm) and the interaction of red (600-700 nm) and far-red (700-800 nm) wavelengths.[5]