Qubit Systems offers various LED light sources.  Simple, calibrated in the software, cold white LED light is used with a flow through leaf chamber. Larger LED panels can be provided with a stand and a controller or software for illuminating plants or algae during growth.  Even larger LED panels can be used in growth rooms and greenhouses as growth lights or supplementary lights.  Various wavelengths of LEDs are available.  Hand held and desk-top spectrometers are available for assessment of light quality and and quantity.