Plants rich in chlorophyll absorb light at almost all wavelengths of the visible spectrum, reflecting only light around the 510nm band (green) where they do not photosynthesize. The Agrolite Darknight bulb is a high-power LED with a filter specially designed to eliminate all wavelengths while respecting it, thus allowing work in greenhouses and indoor crops during hours of darkness, allowing human vision and respecting the maximum the life cycle of plants.