Light spectrum and online calculator The right light spectrum 5 standard spectra, incl. full spectrum Full spectrum for indoor and red-blue for greenhouses For growth and flowering phase of different plants Production of individual spectra on request Light spectrum Plant Lamps Calculator Try our free online calculator for LED plant lamps. Calculate the Grow lighting quickly and easily.As a result of the calculation you get: light diameter and area of the light cone on the plant as well as PPFD (photon flux density). Plant Lamps Calculator​