Philips has been developing light sources for horticulture for many years already. For a deeper understanding of what is required in the greenhouse Philips has close contact with commercial growers. In order to meet these specific requirements we have our own laboratories and test stations and, to further advance our overall knowledge, we contribute to independent research and field testing. This approach has led to the development of no-fuss, highly efficient lamps which have been tailor-made for horticultural usage.