9-13 July 2012
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=11&confId=14"><font color=#ff0000>SAIP2012 PROCEEDINGS AVAILABLE</font></a>

Capability of testing the ageing behaviour of incandescent lamps

13 Jul 2012, 12:00
Oral Presentation Track C - Photonics Photonics


Ms Patricia Govender (CSIR DPSS unit)

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Abstract content <br> &nbsp; (Max 300 words)

The ageing behaviour, with respect to Correlated Colour Temperature (CCT), illuminance and voltage changes across a tungsten halogen lamp were measured and analysed. The lamp was current controlled at ±6.3 A. Data was collected for 0-25 hours and 240-330 hours of operation. The lamp was simply run continuously, hence the seasoning period for the lamp is included in the data.
During the 0-25 hours of operation, the voltage increased by 0.2%, the current decreased by 0.3%, the illuminance decreased by 6.6% and the CCT increased by 14 K. For the operating time of 240-330 hours, the voltage increased by 0.9%, the current stabilised to 0.2% and the illuminance increased to 3.7%. The CCT was measured up to 130 hours, and had decreased by 43 K from the start of the test.
From these results, it was concluded that in terms of CCT this particular lamp is not stable and should be operated for a period of ±60 hours for a maximum change in CCT of 18 K. The illuminance measurements however, show that the lamp stabilises at longer operating times.

Primary author

Ms Patricia Govender (CSIR DPSS unit)

Presentation Materials