Functionality after endurance testing
ANNEX VSupplementary provisions
ANNEX V Functionality after endurance testing Models of LED- and OLED- light sources shall undergo endurance testing to verify their lumen maintenance and survival factor. This endurance testing consists of the test method outlined below. The authorities of a Member State shall test 10 units of the model for this test. The endurance test for LED and OLED light sources shall be conducted as follows: (a) Ambient conditions and test setup: (i) The switching cycles are to be conducted in a room with an ambient temperature of 25 ± 10 °C and an average air velocity of less than 0,2 m/s. (ii) The switching cycles on the sample shall be conducted in free air in a vertical base-up position. However, if a manufacturer or importer has declared the light source suitable for use in a specific orientation only, then the sample shall be mounted in that orientation. (iii) The applied voltage during the switching cycles shall have a tolerance within 2 %. The total harmonic content of the supply voltage shall not exceed 3 %. Standards provide guidance on the supply voltage source. Light sources designed to be operated on mains voltage shall be tested at 230 V, 50 Hz supply, even if the products are able to be operated on variable supply conditions. (b) Endurance test method: (i) Initial flux measurement: measure the luminous flux of the light source prior to starting the endurance test switching cycle. (ii) Switching cycles: operate the light source for 1 200 cycles of repeated, continuous switching cycles without interruption. One complete switching cycle consists of 150 minutes of the light source switched ON at full power followed by 30 minutes of the light source switched OFF. The hours of operation recorded (i.e. 3 000 hours) include only the periods of the switching cycle when the light source was switched ON, i.e. the total test time is 3 600 hours. (iii) Final flux measurement: at the end of the 1 200 switching cycles, note if any light sources have failed (see ‘Survival factor’ in Annex IV, Table 6 of this Regulation) and measure the luminous flux of the light sources that have not failed. (iv) For each of the units in the sample which have not failed, divide the measured final flux by the measured initial flux. Average the resulting values over all the units that did not fail to compute the determined value for the lumen maintenance factor X LMF %.