The connection between lighting, the human visual system and, ultimately, hitman comfort ami productivity, has long been complex and controversial. Even the most basic concept of colour rendering quality is not yet well defined. The connection is all the more critical for solid-state lighting, with its ability to .selectively and perhaps prognnnmably fill the visible spectrum through primary light from chips and secondary light from phosphors. LED chips emit light over a very narrow wavelength and their colours are perceived as nearly pure spectral hues. However, for most illumination applications, while light is required. LED manufacturers can produce while light by mixing LEDs of different colours, e.g., red, green, and blue. This new white light has the potential to change our lives. The wavelength of light radiation influence growth and development of organisms. The bio-stimulator effect has a maximum effect when light radiation is monochromatic: bioresonance.
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