Comparison of Conventional vs LED fixtures in myETC photometrics app.

Trying to compare photometrics between several Source Four fixtures using the myETC photometrics app. Was hoping to get some clarification on how the footcandle values are determined.


1) If I take a standard Source Four 575W fixture, 26 degree, 30ft throw and gel it with R33; I get a 71 fc output. Since this is a lamped fixture I would think this is with lamp throwing no color (obviously) and then a R33 gel placed in it.

2) If I take a Series 2 Lustr fixture, 26 degree, 30ft throw and gel it wtih R33; I get a 45 fc. So may question is... is this number based on the LED engine mixing to the R33 equivalent? or is it assuming the fixture throwing no color and than a R33 gel placed in it? I assume the first.

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