Badanie zmian parametrów eksploatacyjnych wybranych lamp do użytku domowego

Forecasting long term lumen maintenance of LED lamps

“…Nevertheless, they confirmed the need to constantly monitor products on the market, and particularly to carry out tests after 6000 h in order to fully assess the quality of LED lamps. As the tests have shown, even though all the lamps met the criterion of the minimum initial value of the luminous flux [8], only half of them had a luminous flux maintenance coefficient higher than the required one [1]. The tests carried out also allowed to calculate the expected life of lamps based on the initial 6000 h of lamp operation and evaluation of the procedure described in the publication [7].…”

“…Six lamps from different manufacturers were selected for the tests. The basic information available on the packaging of the product as well as the results of measurements of the initial parameters of the tested LED lamps are described in the publication [8]. The appearance of the tested lamps is shown in Figure 1.…”

“…The measurement stand and the measurement of the luminous flux are described in detail in [8,9]. Relative changes in luminous flux of the tested lamps in [%] during the time from 0 to 9000 h of lighting are summarised in Table 1.…”

“…The life L x of a single LED lamp is determined by the time at which the light source provides at least the declared percentage of the initial luminous flux [6]. Measurements of the operational drop in the luminous flux of LED are time-consuming measurements, which is why a method for forecasting the long term lumen maintenance and estimating the life of LED [8] on this basis was developed. The luminous flux drop ('(t)) during operation is described in the publication [7] with an exponential curve:…”

Pomiar i ocena wybranych parametrów bezkierunkowych lamp do użytku domowego

“…Obecnie obowiązujące wymagania [1, 3], w zakresie analizowanych w trakcie badań parametrów początkowych, zestawiono w tabeli 1. Weryfikacja wszystkich wymagań zawartych w rozporządzeniach [1, 3, 4] jest długotrwała i czasochłonna, tak więc zwykle ogranicza się tylko do oceny parametrów początkowych [9,10,11,12,13,14,15]…”