There is provided a light emitting device for plant cultivation comprising: a broadband blue solid-state light source for generating broadband blue light with a maximum emission wavelength from 420 nm to 495 nm; wherein broadband blue solid-state light source generates blue light from 400 nm to 520 nm having an intensity wavelength spectrum which over a wavelength of at least 40 nm has an intensity that varies by less than 25%, less than 15%, or less than 10%; or from 430 nm to 470 nm or from 450 nm to 465 nm has an intensity that varies by less than 10%.