Light & Engineering Vol. 23, No. 1, pp. 79-00, 2015 Svetotekhnika No. 1, 2015, pp. 53-58 ANALYSIS OF PROPERTIES OF LIGHTNING-OPTICAL EQUIVALENTS OF TRADITIONAL BULBS FOR DIMMING Przemysław Tabaka Lodz University of Technology. <...> The major disadvantage of compact fluorescents and LED light sources installed in households was their deployment in combination with light intensity regulators – so called dimmers. <...> The paper presents the results of laboratory measurements of the change in photometric and colorimetric parameters as a function of dimming levels of light sources suitable for dimming. <...> A conventional bulb was examined as well to investigate the question: how far are the changes coherent with photometric and colorimetric parameters of a classic bulb. <...> Keywords: light source, dimmer, spectral distribution, correlated colour temperature, colour rendering index, luminous fl ux 1. <...> LED lights, halogen bulbs and compact fl uorescent lights are all on offer. <...> Unfortunately, only a few of these (apart from halogen bulbs with a voltage capsule) render themselves to dimming. <...> While there 79 are numerous publications describing the features of the equivalents of traditional light bulbs [1, 2, 3, 4, 8, 9, 10, 11, 12, 13, 14, 15], when it comes to light sources designed to work with a regulator of luminous intensity the available literature is rather limited. <...> SUBJECT AND RANGE OF RESEARCH Measurements were made of a traditional 60 W light bulb and its three equivalents: a halogen bulb, a compact fluorescent lamp and an LED source. <...> A schematic model of the lamps tested is presented in Fig. 1. <...> According to the producers, light sources such as a halogen bulb and a LED source can be regarded as close equivalents of a traditional 60 W light Fig. 1. <...> The models of the light sources tested, 1-traditional light bulb, 2-halogen bulb, 3 – compact fl uorescent lamp, 4 – LED source Light & Engineering Table 1. <...> Schematic diagram of the measuring system 1, 6 – mains switches, 2 – voltage stabilizer 3 – autotransformer, 4 – digital voltmeter, 5 –light intensity regulator, 7 – integrating sphere, 8 <...>