Title: LED FILAMENT STANDARD LAMPS FOR TOTAL LUMINOUS FLUX AND LUMINOUS INTENSITY
Abstract: Light emitting dioxides (LEDs) would inevitably replace the incandescent lamps and dominate the lighting market.There is a growing demand for LED measurement and calibration.However, using the incandescent lamp as a standard lamp to measure LEDs would produce great uncertainty.LED filament standard lamps for total luminous flux and luminous intensity are developed to solve this problem.Both the intensity of type A and type B standard LED for luminous flux are uniformly distributed over 4π geometry.The angular uniformity and conformity of the inverse square law of the standard LED for luminous intensity are well satisfied.The developed LED standard have a shorter warm-up time, good short-term stability and repeatability.The luminous flux and luminous intensity are increased by 1.5% ~ 2.5% after 2000 hours aging.