whilst im no expert I would be supprised if the lampost`s
makers/designers chose photo sensitive device that
worked on specific wavelengths, but yes the lampost
needs to switch with daylight.

There must be a delay circuit
in them to stop the lights flickering on and off when the light level
is hovering about the switching threshold

"TeaTime" wrote in message
...

"JohnDH" wrote in message news:45832c5f.0@entanet...

Does anyone know what type of pointer is best? I've been looking on ebay
and there's loads. Red, Green, Any thoughts?

Cheers John DH

The photocell used to control street lights is chosen to peak on normal
sunlight, so green would be a much better choice than red.