Thanks Birddog
Sounds logical.
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Just wondering what hard disk space you'd eat up continually recording - or whether iit should just trigger on proximate motion (i.e. via a highly directional motion sensor hooked to both recording cameras (normal and IR - and not via car traffic on the busy road out front)).
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I certainly don't recommend Electronic Interiors (Perth). They charge for advice and will give it only if you undertake to implement it on their terms and at their over-the-top prices. They "shill" for Artique (builders) who'll only use them under contract and who also come highly UNrecommended.