What kind of spectrum is needed to grow cannabis?
What is a Light Spectrum? The visible light spectrum falls between 380 nm to 750 nm (nanometers). This is the spectrum that we as humans can see, but plants use an even broader spectrum of light for photosynthesis. Plants can ‘see’ ultraviolet wavelengths to infrared, and everything in between. In normal outdoor growing conditions, the light spectrum shifts subtly through the seasons. From spring into fall, the light shining on plants determines how they grow. As the seasons changes, plants are triggered to enter into vegetative and then flowering stages of production. 180-280nm - UVC: Extremely harmful and luckily almost completely absorbed by the ozone layer 280-315nm – UVB: Cause of sunburn and suspected to increase THC levels (!) 315-400nm – UVA: Not absorbed by the atmosphere, commonly known as black light 380-750nm – The visible light spectrum: Bands of wave lengths represent visible colours 700nm-1mm – Infrared light: Not visible above 750nm but noticeable as heat on ...