Why is it necessary to use absolute photometry for LEDs?


The lumen output of a LED is dependent on the thermal management / heat sink design, the electrical characteristics such as the junction and rated ambient temperature and driver currents as well as the optical system. This means the light output is very much dependent on the design of the actual luminaire. This is unlike other light sources like HID where the photometrics of a luminaire are fairly independent of the lamp used.




Smart Buildings

19.10.2016, Birmingham NEC

Presentation: ‘Connected Lighting for Offices - Beyond Illumination’ by Darren Smith

Grand Designs Live

Find us on Stand L190, Technology Zone,
Hall 5

19-23.10.2016, Birmingham NEC

Highway Electrical Association (HEA)
Annual Conference
03.11.2016, Celtic Manor, Newport


9-10.11.2016, Canary Wharf, London

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