Annex D
(normative)
Testing of electrically powered low-location lighting systems
D.1 Foreword
D.1.1 Electrically powered Low Location Lighting (LLL) systems are required to provide a luminous performance appropriate to the application. The minimum values specified are relatively low and the laboratory equipment necessary for the measurements shall be suitable for luminous intensities at milli-candela levels (mcd) and surface luminance values of approximately 10 cd/m2.
D.1.2 The required measurements are based on standard photometric principles as required for electric luminaires.
D.2 Purpose
D.2.1 The EP LLL systems are required to provide a minimum intensity in the direction appropriate to the likely viewing angles for point sources and to provide a minimum surface luminance for planar sources.
D.2.2 The luminous performance measurements shall assess one fully installed single point source, including the optical arrangement designed to ensure that the minimum intensity is provided at the appropriate angles.
D.2.3 For planar sources luminance measurements shall be made at ten points along the length of a representative sample.
D.3 Preparation of samples
D.3.1 Mounting of samples and equipment
All tests shall be made with the samples mounted to represent the normal installed condition. All equipment shall be mounted ready for testing in accordance with CIE 121 - 1996.
D.3.2 Planar Sources
D.3.2.1 Samples shall be at least 1 meter long (or sufficient sections to make up 1 meter).
D.3.2.2 The Sample shall be connected to a stabilized power supply adjusted to provide the nominal operating voltage for the system.
D.3.2.3 The sample shall. be operated at an ambient temperature of 25℃ ± 2℃ and left to stabilize.
D.3. Point sources
D.3.3.1 A sample shall be prepared so that only one single source or arrangement of sources is exposed.
D.3.3.2 The sample shall be mounted on the goniophotometer and connected to a power supply adjusted to provide the nominal operating voltage for the system.
D.3.3.3 The sample shall be operated at an ambient temperature of 25℃ ± 2℃ and left to stabilize.
