Sensors often are used to turn on a light. There is no need to do so when ambient light is already in the area. The non-IR sensor referrers to the ambient light sensitivity A.
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Context ? One would say sensitivity, but Lux is weighted to human visible - IR ain't,.
Whether this(lux) parameter plays important role?Does sensitivity is related to lux of PIR sensor?
Presumably. Show me a datasheet.
Check this link..... http://www.lampfind.com/lampby_1210714_PIR-motion-detector-module.htm
Doesn't mention lux. But it DOES say the things have a CdS sensor. I wonder if the CdS sensor is what is rated in lux.