LED (Light Emitting Diode) is an innovative form of lighting that presents many advantages to the production of greenhouse plants over the traditional high pressure sodium/HD lights. In particolar, LED lamps, according to the semi-conductor materials utilized, can be made to emit specific ranges of different coloured light from infrared to ultaviolet without the use of colour filters. By designing LED lamps to emit the red and blue spectrums used in photosynthesis, savings of up to 75% can be made by cutting out the rest of the spectrum. This makes them highly suited to provide crops with supplementary light in the PAR range (photosynthetically active radiation) and to provide appropriate light to extend daylength and solicit flowering responses, amongst other things.