Considerable energy savings are expected from environmentally friendly LED lamps, because lighting accounts for about 20 % of all electricity use. Reliable measurements are in an essential role to demonstrate and characterize the improved performance of the new light sources. Important quantities to be determined include luminous efficacy, spectral and angular distribution of the radiation, and electrical parameters. Here practical measurement setups are described for all of these parameters and differences as compared with halogen lamp measurements are considered. Furthermore, limiting values of the different uncertainty contributions are discussed.
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