Untitled - Journal of Lighting Engineering

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Benchmark report on the photometric and electrical performance of LED replacements 3. Electrical measurements The first step was to measure the electrical characteristics of the lamps. A FLUKE Norma 4000 power analyzer was used for this purpose. Each lamp was fitted to a bare GU10 socket that was connected to the power analyzer. A voltage stabilizer (230 V AC) was used as power supply. The lamps were not fitted to any housing or any type of luminaire in order to avoid thermal stress of LEDs. Table 2 Measurement of the electrical characteristics of the tested LED lamps. Toshiba Megaman Before the measurements, each lamp was operated for at least one hour. The measured electrical quantities where: supply voltage, lamp current, apparent power, active and reactive power, power factor and the total harmonic distortion (THD) of the current. Table 2 shows the results of the measurements. The last column contains the electrical characteristics of a typical 50 W halogen for a direct comparison. Ingineria Iluminatului 2012; 14, 2: 7-16 9 Philips Sylvania General Electric Osram Halogen (typical) Vrms (V) 230 230 230 230 230 230 230 Irms (mA) 55 49 46 42 34 44 220 P (W) 8.7 7.7 7.0 8.2 6.6 9.6 50 S (VA) 12.6 11.4 10.6 9.6 7.7 10.0 50 Q (capacitive) (VAr) 9.1 8.4 8.0 5.0 4.0 3.0 0 PF 0.69 0.68 0.66 0.85 0.85 0.95 1.00 THDcurrent (%) 69 69 80 53 53 30 0 4. Photometric measurements 4.1 Measurement of the luminous flux The measurement of the luminous flux was carried out using a goniophotometer (Figure 2). The first step was to measure the distribution of the luminous intensity of each lamp. Each measurement was performed in CIE C-planes with 15º steps of C-planes and 2.5º of gamma angles [3]. The lamps were left to operate until their luminous intensity stabilized. In some cases, this took more than one hour. The luminous flux was then calculated with integration of the above measurements. The result of the luminous flux measurement (averaged values from two measurements) are presented in Table 3. Figure 2 The goniophotometer for the measurement of the luminous intensity distribution of the lamps.
C A BOUROUSSIS, E-N D MADIAS, P A KONTAXIS, F V TOPALIS Table 3 Measured * and calculated photometric quantities of the tested LED lamps. 10 Toshiba Megaman Philips Sylvania General Electric Osram Halogen (typical) Luminous flux (lm) 308 309 312 303 368 353 350 Luminous efficacy (lm/W) 35 40 45 37 56 37 7 Maximum luminous intensity (cd) 679 791 677 787 745 786 600 * Average values from measurement of two samples of each lamp type. 4.2 Measurement of the spectral distribution The spectral distribution was measured using a high precision spectrometer (ORIEL Instruments, MS260i 74086) with Figure 3 Measurement of the spectrum of two samples from each lamp type. 1 nm step and the results are shown in Figure 3. The curves are normalized to the maximum spectral power of each measurement. Each sub-figure contains the spectra of two samples from each lamp type. Ingineria Iluminatului 2012; 14, 2: 7-16
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