Light emitting device and plant cultivation method

A light emitting device comprising:

• a light emitting element having a light emission peak wavelength in a range of 380 nm or more and 490 nm or less;
• and
• a fluorescent material that is excited by light from the light emitting element and emits light having at least one light emission peak wavelength in a range of 580 nm or more and less than 680 nm, wherein
• the light emitting device emits light having a ratio R/B of a photon flux density R to a photon flux density B within a range of 2.0 or more and 4.0 or less, and a ratio R/FR of the photon flux density R to a photon flux density FR within a range of 0.7 or more and 13.0 or less, wherein
• the photon flux density R is in a wavelength range of 620 nm or more and less than 700 nm,
• the photon flux density B is in a wavelength range of 380 nm or more and 490 nm or less, and
• the photon flux density FR is in a wavelength range of 700 nm or more and 780 nm or less.