Green light allows you to visit the culture room during the hours of darkness to minimize stress on the plants and changes in their life cycles. High power halogen, 100W. Plants rich in chlorophyll absorb light at almost all wavelengths of the visible spectrum, reflecting only light around the fringe of 510 nm (green) which do not perform photosynthesis. Darknight Agrolite bulb is a high power halogen with a filter specially designed to eliminate all wavelengths respecting this, in this way to work in greenhouses and indoor growing during the hours of darkness, allowing human vision and the utmost respect the life cycle of plants.