Annex A
(normative)
Testing of photoluminescent low-location lighting materials
A.1 Purpose
To assess the required excitation for photoluminescent materials to comply with the required luminance performance under controlled laboratory conditions.
A.2 Term(s) and definition(s)
A.2.1 excitation
the effect of visible light in the appropriate spectrum which allows the materials to store energy
A.2.2 luminance
the luminous intensity per unit area of the material measured in mcd/m2.
A.2.3 luminance decay
the function of the diminishing luminance exhibited by the material over time.
A.3 Material samples
At least two samples of representative commercial materials shall be tested. Where the dimensions of the standard materials are not suitable for the luminance measurement instrumentation, special test samples shall be prepared having suitable dimensions for measurement purposes.
A.4 Testing
A.4.1 Excitation shall be provided by a tubular fluorescent lamp having a color temperature of 2700°K.
A.4.2 Test samples shall be dark conditioned for at least 24 hours prior to excitation.
NOTE The intent is to fully discharge the materials prior to excitation.
A.4.3 The conditioned samples shall be excited directly for at least 24 hours with an anticipated average illuminance for the materials to meet the luminance requirements specified in clause 4.2.2 of this standard.
NOTE The intent is to fully charge the materials at the chosen illuminance.
A.4.4 The excitation illuminance shall be measured within the same plane as the test sample and recorded for each test.
A.4.5 The luminance measurements specified in clause 5 of this Annex shall be repeated until the excitation parameters are established in compliance with clause 4.2.2 of this standard.
A.4.6 Ambient temperature during tests shall be 23℃± 2℃.
