My measured photometry shows a much sharper cutoff than that measured by Photopia. Where does the discrepancy come from?
This discrepancy may come from the angular resolution of the photometry you have specified in Photopia. Real photometers measure the luminous intensity at specific points while Photopia counts the number of lumens that fall into a particular zone and calculates an average luminous intensity for that zone. These methods produce similar results for small angular zones. As a test, try decreasing your specified angular increments and increasing the number of rays. The angular settings may be changed in the Photometric Settings window. The number of rays may be increased in the Raytrace Settings window. If you continue to see a discrepancy, please contact Lighting Technologies. Q: The photometric results for my luminaire do not make sense even though all of the surfaces in my model seem to be oriented properly. Sometimes rays go through reflector surfaces and other surfaces that are reflective absorb much more light than they should. A: Check to see if you checked the Raytrace option to “Op
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