"Harry Bloomfield" wrote in message
k...
John laid this down on his screen :
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.

I don't quite follow your question...

It is simple electronic logic, as in - If light has been turned on, then
ignore input from p/cell until light times out and goes off. If light is
out then enable p/cell.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk



I was judging my input from an Osram CFL with integrated sensor. When
it was first plugged in it did not work but after a few days it settled down
& coped with varying day lengths. When it finally gave up I investigated
& the logic was based on a microcontroller with embedded non volatile
memory. My
guess was that it was learning the varying light levels & setting the switch
point
accordingly. The replacement (different mfr) is doing the same.

This may be the norm for those without adjustment. Worth a try just leaving
it
for a few days and see if it sorts itself out if there is no adjustment.

Chris K