Chlorophyll-rich plants absorb almost all wavelengths of visible light,
they basically reflect light around 510nm(Green) where they do photosynthesize. Agrolite Darknight is a powerful halogen bulb with a special filter which eliminates all wavelenghts except that of green,
this allows us to work in greehouses and internal cultives at night time ,
human vision is preserved but we respect the life cycle of plants.