Far red light, also known as FR light, is a waveband at the extreme end of the visible light spectrum, with wavelengths between 700 and 780 nanometers (nm). It falls outside the range of photosynthetically active radiation (PAR), which includes wavelengths between 400 and 700 nm. While far red light has traditionally been considered to have minimal input in photosynthesis, recent studies have shown its unique ability to enhance the efficiency of photosynthesis when combined with shorter wavelength light.