Analysis of the transition of local lighting fixtures in Ukraine to Led-analogues based on a comprehensive study of their light distribution

Abstract

The purpose of this work is to study the state of the problem of transition of local lighting fixtures in Ukraine to LED counterparts. At present, there is almost a complete abandonment of the use of traditional light sources, due to the low light output of these sources, low service life, environmental considerations, and so on. However, the main requirement for lighting fixtures of any type is the compliance of their light distribution with the visual tasks that will be assigned to them during operation. As for most outdoor and indoor lighting fixtures, they are, in fact, certified, and their light distribution is given in one form or another either in the passports of the device, or in technical descriptions of relevant products on the websites of manufacturers or in catalogs. As for local lighting fixtures – table lamp fixtures, such information is not provided to the buyer. However, there are generally accepted recommendations for the light distribution of such lamps. Namely - the light distribution should be uniform and direct illumination on the work surface should be close to 200 lux. If you deviate from these requirements, the consumer may face problems such as visual impairment and stooping. As the volume of production of local lighting fixtures is significant, the authors set themselves the task of understanding whether modern models of these fixtures meet these standards. The paper presents data on the systematic study of the light distribution of local lighting fixtures for a considerable period of time. It is shown that the first samples of LED lights did not meet the requirements for their light distribution, which was confidently provided by lights based on compact fluorescent and halogen lamps. But gradually the light distribution of LED-lights approached the cosine and today for the vast majority of LED local lighting fixtures on the market it can be stated that their light distribution is absolutely adequate and further use of traditional light sources for local lighting can be completely stopped. It is also noted that the vast majority of modern table lamps are equipped with dimmers, what allows to flexibly adapt local lighting modes to solve specific visual problems in addition to other energy savings.