Which bulb for exterior PIR light?

[FrodoOne]

Well !
They should not be so - because it makes it more difficult to replace one (part) without the other.
Persons who purchase "combined" units are setting themselves up for increased expense.
When one or the other "part" of any combined "unit" fails there is then a "need" to replace both.

 

[JohnW2]

Well !
They should not be so - because it makes it more difficult to replace one (part) without the other. Persons who purchase "combined" units are setting themselves up for increased expense. When one or the other "part" of any combined "unit" fails there is then a "need" to replace both.

As I said, I would agree if the lamp/bulb is not replaceable (since, with a combined' unit, one would be pretty likely to end up having to throw away a perfectly good PIR because a lamp/bulb had failed) - but, if it is replaceable, then I'm far less convinced about your "should not". As I said, in that case a combined unit is merely a PIR plus a lampholder, and the latter is pretty unlikely to ever need replacing.

As for "increased expense", the way of a world is such that getting separate PIR and 'light units' is quite likely to be appreciably more expensive than a 'combined' one - so that needs to be part of the equation as well.

Kind Regards, John