First of all, we should know difference between artificial
grow lighting and sunlight. The difference is – most artificial light doesn't emit as much energy in the red and blue region of the light spectrum as sunlight does. The sun, a torch, and a light bulb all emit energy in the form of particles called photons. The photons from the sun are a product of thermonuclear fusion. A torch uses a chemical reaction to burn. A light bulb converts electricity to photons. But a photon is a photon – and light is light – whether it comes from the sun or a flashlight. Researchers can successfully grow plants using only artificial light in growth chambers.