| Popis: |
Specialists of design and installation companies regularly face the need to select lighting devices, which often turns to be quite difficult task in connection with the modern state of the market of lighting production. Indeed, among the items presented in the market by the lighting equipment manufacturers, there is a noticeable share of lighting devices of degraded quality that have relatively poor lighting characteristics. Accordingly, since there is lack of confidence in the quality of some lighting products from individual manufacturers, there is a need of checking the technical parameters of LED products by the consumer himself, or by specialists of design and installation organizations. The aim of this study is to measure various lighting parameters of lighting devices equipped with semiconductor light sources for checking if the lighting parameters specified in the technical documentation are correct enough, and how reliably the LED-based lighting devices operate under different technical and climatic conditions. Six samples of LED-based lighting devices commercially available from two manufacturers were taken as study objects. The technical parameters of the studied energy-saving LED-based lighting devices were estimated by way of comparison, and their individual characteristics, such as the radiation angle, the type of light intensity curve, pulsation coefficient, and nominal voltage declared in the light devices’ data sheets were compared with the data obtained experimentally from measurement results. Shortcomings of the technical solutions and inconsistency between the measured values of pulsation coefficient and those declared in the data sheet of one type of light devices were revealed. This device features increased heating parameters, which entails accelerated degradation of the parameters and characteristics. |
