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LabSpion user guide
Spherical limit
Spherical limit allows the user to limit area of lumen
integration, this is also known as measuring luminous flux in
a
Φ cone.
Luminous flux measurement is normally done at full 360° in
all direction. But new EU regulations (EU No 1194/2012)
require that directional
lamps are measured in
a 90° or 120° cone,
meaning that only light
illuminated in the cone is
calculated efficient
luminous flux.
The spherical limitation can be set by
clicking Edit->Spherical limit.
Spherical limitation does not need to
be set before making a measurement
but can be set afterwards, also on
previous made full 360°
measurements. Below is an example of difference in lumen
at 90° cone, where 57 lm is wasted outside the 90° cone.
