BS EN 62639:2012 pdf download

BS EN 62639:2012 pdf download.Fluorescent induction lamps -Performance specification.
B.1 General
Before the lamps are measured for the first time, they shall be aged for a period of 100 h at their rated values. The supply voltage is held ± 5 % of its rated value during ageing.
Lamps shall be conditioned and tested in a draught-free atmosphere at an ambient temperature of 25 C ± 1 C, unless otherwise specified on the relevant lamp data sheet2.
Lamps shall be tested In the position as specified on the relevant lamp data sheet. In this position the lamp is kept switched off for 16 h to 20 h after at least 24 h of Continuous operation, then started again and stabilised for at least 2 h before the measurement starts. The 24 h Is part of the 100 h ageing.
NOTE in orde to warm up, the lamp may be operated rn a location, distant to the teat iocation When moving to itt. t.st location. a Further stabilisation penod nay b. n.c.ssary in th l.st location Tb. interruption o4 lh supply Should be as short as possible, and the additional stabiiisahon penod thouid be at least 15 mm.
B.2 Measurement of photometric characteristics
Photometric characteristics shall be measured in accordance with the relevant recommendations of the CIE (Commission Internationale de l’Eclairage)
When measuring In a suitable photometric integrator, the ambient temperature Is taken to be
the air temperature at the following position:
— at a distance from the bulb wall of not less than 10 % of the nominal diameter of the integrator;
— at a distance from the wall of the integrator of not less than one-sixth of the nominal diameter of the integrator,
— near the lamp axis on a level with the centre of the lamp.
A uniform temperature distribution in the integrator shall be maintained during the lest. In the
horizontal plane containing the lamp centre, except in the immediate vicinity of the lamp wall.
a unIform temperature of ± 1 C is required. Special care Shall b taken If the integrator
incorporates a heating system
Other measurement devices can be used, if the distance and temperature requirements are met. In case of doubt, the integrating sphere shall be used.
The temperature is usually measured by a thermocouple or a thermistor, both protected against radiation by a small shield.
Measurement of light output shall be taken at least once per minute for 15 mm, During this time, no reading of light output shall differ by more than 1 % of the minimum reading. If this is not feasible, the real fluctuation shall be stated.
Alternatively to the measurement of light output, the related lamp voltage or lamp current may be taken as indication 01 light output stability, provided the suitable voltage or current measuring instruments allows a reading of t 2.5 % of rated lamp voltage or current respectively. Whether voltage or current might be used depends on the type of ballast the lamp is operated with. For a constant current source, the voltage would indicate stability, for a constant voltage source the current needs to be monitored. If the ballast operates the lamp at constant power, one out of both quantities might be chosen.
For measurement of CCT. chromaticity co-ordinates x and y and Ra, refer to IEC 60081, Annex D.
For values and tolerances of the Colour Rendering Index (CR1), refer to the lamp manufacturers literature.
Lamps might be operated for aging on commercial ballasts which comply with the given electrical characteristics as in lamp data sheets and with heat sinks, if applicable, as given in IEC 62532. For the reading of an aged lamp, the lamp shall be operated with specially prepared ballasts which are capable to operate the lamp with the electrical characteristics as given in the lamp data sheets. The parameter chosen for control of lamp operation (voltage. current or power) shall be kept within ± I % ol the given value in the relevant lamp data sheet. The circuit is schematically shown in Figure B.1.
Due to the polarity of the lamp, it has to be safeguarded that ballast and lamp terminals are correctly connected together.
NOTE Tue correcl conneclion can be done tor example by marking Ifle terminals, by en unmistakable comuNnation ol plugs, or by wire colour coding.
B.3 Electrical instruments
Instruments shall be of the true r.m,s. type, essentially free from waveform errors and suitable for the frequency of operation.
The voltage measuring circuit of the Instruments shall have an impedance not less than 1 Mt. and shall be disconnected when not in use. The current measuring circuIt of the instruments shall have the lowest possible resistance and, if necessary, shall be short-circuited when not in use.
When measuring the lamp power, no correction shall be made for the wattmeter consumption (the circuit connection being made on the lamp side of the current measuring circuit).