One type of light that can be used for photosynthesis is red light, specifically in the wavelength range of about 600–700 nm. Red light is highly effective because chlorophyll-a, the main pigment involved in photosynthesis, absorbs red light efficiently to drive the photosynthetic process

. Additionally, blue light (425–450 nm) is also important as it is absorbed by chlorophyll-b and helps power photosynthesis by providing high-energy photons

. Together, red and blue light are the best wavelengths for promoting photosynthesis in plants. Artificial light sources such as LED "plant bulbs" that emit strong red and blue light are ideal for supporting photosynthesis, as they provide the optimal wavelengths without excess heat that can damage plants