DefinePK

Abstract

The present work focused on analyzed the uncertainty spectral mismatch factor for Spot White Light Emitting Diodes Lamps (LEDs) and Compact Fluorescent Lamps (CFLs) by applied the method of ISO Guide to Expression of Uncertainty in Measurements. The excel program build for calculating the spectral mismatch correction factors and their uncertainties from the spectral power distribution (SPDs). A set up based on National Institute of standards of Egypt (NIS) Spectroradiometer and the photometric bench used for measuring the spectral power distribution of the test lamps against the NIS luminous flux standard lamps. The spectral power distributions (SPDs) diagrams for Spot White Light Emitting Diodes Lamps (LEDs) and Compact Fluorescent Lamps (CFLs) showed typical White LEDs and CFLs responses. The results of spectral mismatch correction factors show that theses mismatch values and their uncertainties could be added to the of luminous flux measurements as correction. The color temperature of the standard lamps varied from 2400 Kelvin to 2750 Kelvin which has effect on the uncertainty.