John wrote:
If they are too sensitive to light then they 'see' their own light
and switch off.

Not quite - the sensor can be and is ignored when the light has been
turned on to prevent them cycling, besides which there a tremendous
difference between the levels of daylight and that provided by a
lamp. --
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk


Surely it depends on the lamp shade or fitting. Some may keep natural
light away from the sensor.

If the sensor can ignore its own light then how can it detect the
daylight of the morning - I guess it would only be a simple photo
cell.

Agreed. I can't get my head around this at all.

I have a dawn/dusk light outside the front door. Outside the attached
garage I have a 500w security light activated by a switch. When I turn this
on the dawn/dusk goes out, when I turn it off the D/D comes back on.

So how come the D/D doesn't react to its own light & turn off?


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk