To be precise the PIR senses changes in the heat image it can see, very slow changes are ignored. Some sensors will react to a bright light source as the sensor material's spectrum extends ( un-intentionally ) beyond the Infra Red but with much lower sensitivity.
It wouldn't. However, I wasn't talking about the PIR sensor, or of triggering it. I was saying that if the light sensor (photocell or whatever) of your background lighting could 'see' the floodlight, then when the floodlight came on, the other one's light sensor might think it was seeing daylight, and would therefore switch off.
I suppose that has to be theoretically true, although I've never been aware of it happening in practice.
Again, I suppose that's not impossible but (a) the light has to be bright enough to get through the semi-opaque 'lens' and still have enough energy to be sensed by a detector that wasn't designed to be sensitive to visible light in the first place and (b) would have to be a very 'narrow' source to only appear on one set of images. I would imagine that such very bright and very narrow light sources are pretty rare.
Semantics/terminology again, I suppose.
Not really.
I thought you meant you didn't know what 'opaque' meant.
If one takes that totally literally, then I suspect that, just as with literal "non-combustible", few materials would actually qualify.
That's only true, if, as is the case with pregnancy, one regards opaque (or non-opaque) as totally dichotomous - which it sounds is your view. However, I think that most people have an understanding of what is meant by phrases such as "semi-opaque".
You could say the same about fire - but light does not pass through opaque materials until a hole has been made.
They may determine what you mean by an incorrect term but it is still incorrect.
You said that light cannot penetrate an opaque object, but that clearly is not true when the light is in the form of a powerful laser beam - the light can penetrate an 'opaque' object in the same manner that a drill or nail could.
Why, what's happening?
It depends how the lights are wired.
A three gang switch would look better.
Not regulation-wise but it is advisable for outside lights as they may get wet and affect the rest of your lights.
That's climate change profiteering.
The extended family is, as I speak, grouping its forces in preparation for a co-ordinated invasion of what is probably the largest house the family has to offer
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