Light & Engineering Vol. 23, No. 3, pp. 85-88, 2015 Svetotekhnika No. 2, 2015, pp. 48-50 NEW CIRCUIT SOLUTIONS FOR THERMAL DESIGN OF CHANDELIERS WITH LIGHT EMITTING DIODES Timofei Yu. <...> Nikolaenko and Yuri E. Nikolaenko The National Technical University of Ukraine “Kievsky Polytechnic Institute” and the Kievsky National University of Taras Shevchenko, Kiev, Ukraine E-mail: yunikola@ukr.net ABSTRACT A new approach to the design of energy effi cient chandeliers with light emitting diodes (LEDs) to illuminate rooms is proposed. <...> The essence of this approach is manufacture of elements of chandelier decorative frame as thermal tubes (TT) and use of light-emitting diode modules (LEDM) installed within them as light sources. <...> TT application allows removing heat from the LEDMs and dissipating it by means of a heat exchange extended surface, which is provided in the TT cooling area. <...> Due to the increase of heat removal efficiency, LEDM power and luminous fl ux can be increased at least twice in comparison with the correspondent light-emitting diode lamps of direct replacement (DRLEDL). <...> Keywords: inner illumination, chandelier, light emitting diode, light-emitting diode module, thermal tube, heat removal INTRODUCTION Between 19% and 22% of electric energy generated globally is consumed for illumination [1]. <...> The introduction of energy saving technologies into illumination systems of domestic and public buildings allows for a signifi cant saving in electrical energy. <...> Light-emitting diode light sources (LEDLS) present excellent opportunities for use in systems of indoor illumination. <...> A rise of the crystal temperature above 85 º C leads to a decrease in service life and luminous fl ux and to changes in the chromatic characteristics of the LED’s radiation. <...> Therefore, the problem of supporting a normal thermal mode of LEDLSs as a part of a lighting device (LD) is very topical. <...> TRADITIONAL TECHNICAL SOLUTIONS FOR SUPPORTING A NORMAL THERMAL MODE OF LEDs IN LDs FOR INDOOR ILLUMINATION Usually, LDs for illumination of rooms in domestic and public buildings were pendant luminaires in the form of chandeliers with decorative elements in the frame and with incandescent lamps installed in light diffusers. <...> Heat removal from LEDs in the DRLEDLs is achieved by means of a built-in radiator [5]. <...> The geometrical <...>