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I need to measure luminance vs angle characteristics of an led lamp. I have access to a lux meter and a luminance meter. The problem is, that the luminance meter can only measure luminance within 1 degree, and the lamp is about 100cm x 2cm with LEDs about every 4cm, so the diffusor is not evenly lit. How should I go about measuring the luminance of the whole surface? Should I do many measurements along the lamp and do some kind of average? I even have a robot that could move the luminance meter by increments of 1mm or so. Or maybe should I measure the light with the lux meter and somehow calculate the luminance from that and the surface area?

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  • $\begingroup$ That's what pinhole apertures are for. Another thing: since your strip-lighting is periodic, you really only need to measure from one end to about 4 LEDs' length along (so you get the end measurement as well as the uniform central region measurements). $\endgroup$ – Carl Witthoft Jul 22 '16 at 12:42
  • $\begingroup$ But how should i measure it? How can i measure the luminance of a rectangle when my meter measures in a circle? $\endgroup$ – Jan Sobków Jul 25 '16 at 2:23

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