CSA C870-12:2017 pdf download.Performance of general service lamps
4.2.1 General
The minimum number of specimens for each test as specified in Table 1 shall be used. Specimens shall be selected in a manner that ensures proper representation of current designs.
4.2.2 Defective specimens
If a specimen breaks or becomes defective for reasons not connected with testing, it shall be discarded.Similarly, if a lamp fails to stabilize or exhibits abnormal behaviour, it shall be discarded. Testing shall resume with a suitable replacement specimen that is selected and prepared in the same manner as the original specimen. The use of replacement specimens shall be noted in the test report.
4.3 Seasoning
4.3.1 Minimum seasoning period
With the exception of solid state lamps (SSLs), which do not require seasoning (see IESNA LM-79), lamps chosen for luminous efficacy and CRI measurements shall be seasoned before testing for a minimum period of 100 h or 0.5% of their rated life, whichever is less, at rated voltage and an ambient temperature of 25±10°C.
4.3.2 Obtaining initial data
Photometric data obtained immediately after the seasoning period specified in Clause 4.3.1 shall be the initial data used for rating purposes.
4.4.1 General
Lamps shall be stabilized before testing. The time to reach stabilization shall be noted in the test report.
Note: Stabilization depends on the type of technology. Incandescent lamps reach a stable condition more rapidly than other technologies.
4.4.2 Stabilization of incandescent lamps
Photometric measurements shall be made after the lamp has been stabilized (which normally takes 5 to 10 min for incandescent lamps).
The following method may be used for determining when an incandescent lamp is stable:
(a) Take five consecutive measurements of the lamp light output at 15 S intervals (total time= 1 min).
(b) Calculate the percentage difference between the maximum and minimum measured values (relative to the maximum measured value).
(C) If the value calculated in accordance with Item (b) does not exceed 0.25%, the lamp is considered stable.
(d) If the value calculated in accordance with Item (b) exceeds 0.25%, repeat Items (a) and (b) until the values does not exceed 0. 25%.
Because there are degrees of lamp stability, the 0.25% criterion should be considered a guideline only.When the criterion is exceeded, the photometry results are not necessarily invalid. However, if a calculated value of greater than 0.25% is accepted, the likelihood increases that another test facility will obtain dissimilar measurement results for the same lamp, even when the same method is used. If the criterion is exceeded, the exceedance value shall be noted in the test report.CSA C870-12 pdf download.