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Many thanks all of you for taking the trouble to reply. I appreciate your input and particularly "Marvo's" explanation and I will go ahead and instal the sensor. My query was simply that I could not understand how a sensor could keep a light on when the surrounding area was bathed in light but...

Once again many thanks for your reply. If what you say is correct then none of the Energy Saving bulbs which have integral day/night sensors ever stand a chance of working as the light bulb is no more than a few inches away from the sensor and I am sure the manufacturers such as Osram who...

Many thanks Andy but that did not answer my query ie Do photocells detect light produced from light bulbs or only natural light ? If anyone knows the answer to this, I'd be gratefull.

Hi everyone. I am thinking of installing a standalone night sensor unit to illuminate a light in my porch but I understand from various sources that some work and some don't.  What I would like to know is - When the photocell detects dusk or darkness and switches the light on, does it not then...