Flicker Vision of Selected Light Sources

Abstract

The results of the laboratory research concerning a dependence of flicker vision on voltage fluctuations are presented in the paper. The research was realized on a designed measuring stand, which included an examined light source, a voltage generator with amplitude modulation supplying the light source and a positioning system of the observer with respect to the observed surface. In this research, the following light sources were used: one incandescent lamp and four LED luminaires by different producers. The research results formulate a conclusion concerning the description of the influence of voltage fluctuations on flicker viewing for selected light sources. The research results indicate that LED luminaires are less susceptible to voltage fluctuations than incandescent bulbs and that flicker vision strongly depends on the type of LED source.

Estimating the Impact of Arc Furnaces on the Quality of Power in Supply Systems

“…Flicker, to which the eye of one person is sensitive, may be unnoticed by another person [31][32][33][34][35][36]. The type of light source may also play a fundamental role in the perception of flickering [37][38][39][40][41]. At a certain amplitude and frequency of changes in voltage fluctuations, flickering light causes nervousness in people, reaching the level of irritation, beyond which most people are not able to do any work related to the perception of objects of small dimensions, Energies 2020, 13, 1462 4 of 30 poorly contrasting with the surrounding background.…”

Influence of Sampling Rate on Flicker Assessment by IEC Flickermeter Built-In AMI Energy Meters

“…The set of equations ( 21), (24), and ( 27) forms a flickermeter's signal chain model considering the sampling rate f s . As previously mentioned, the flicker occurs for f i < 2f c , and the presence of P st > 0 for f i > 2f c indicates a flickermeter implementation error.…”

“…A correct implementation should meet the condition P st = 0 for f i > 2f c . For equations ( 21), (24), and (27), this condition is met if u i = 0 for a > 0. Otherwise, the P st measurement result is affected by the aliasing.…”

“…Therefore, it is necessary to plan laboratory measurements in such a way as to reliably reproduce the characteristic P st = f (f i ) in the shortest possible time. It is helpful to use a flickermeter signal chain model defined by the set of equations ( 21), (24), and (27), to plan measurements. The model equations should include the u i value of interharmonic component and the sampling rate f s .…”

“…The susceptibility of other light sources to voltage fluctuation, that is, the influence of voltage fluctuation on flicker occurrence, depends on the operating principle of lamps [17]- [22]. For example, LED lamps can be more or less susceptible to voltage fluctuations depending on type of LED power supply [23], [24]. Interharmonics, in addition to causing a flicker, can negatively affect other types of loads [25], [26].…”