ANALYSIS OF SPECTRUM OF SELECTED LIGHT SOURCES IN THE CATEGORY OF TIME STABILIZATION

Abstract

The article presents the results of radiation spectrum analysis of selected sources of light, typical for internal use, such as fluorescent compact light, LED light bulb and halogen light bulb. In the course of research changes occurring in the factorization of spectrum during the adopted time of observation have been analyzed. The time of observation conformed to the time needed for colour of analyzed sources of light to be stabilized. Series of spectral decompositions of energetic luminance have been registered: directly after analyzed sources of light have been put on, after a couple of minutes and after the photometric parameter of colour has been stabilized. Making use of the fact that spectral decomposition determines the colour temperature Tb of emitted light radiation and Colour Rendering Index Ra, a spectral analysis of respective light sources has been conducted. The aim of the analysis was to determine sources of light which allow for rapid differentiation of colour details of visual objects. The objects also need to be characterized by CRI of at least 80% after power has been supplied. Light sources with aforementioned parameters are of use in rooms where visual work necessitates reaching target value of light parameters in the shortest time possible (archives, warehouses, bathrooms). It has been ascertained that those requirements are only met by halogen bulbs and solid-state LED sources. They are characterized by radiation specter which is constant in time and contains all components of radiation. Values of light parameters connected with the emitted colour take less than 30 seconds to stabilize. Fluorescent sources which were being tested are not fit for purpose, in spite of good level of bringing out colours, due to lengthy time of stabilizing the colour.