need a product name. whats the ligh sensor thing called?

when the sun goes down the light sensor thing turns on the lights. what is that thing called?

Photocell.

thanks yall.

Idlewild wrote: Photocell.

AKA:
'Photocell' is new to me; I'd heard it called 'light-dependent resistor (LDR)'.
Wikipedia redirects 'photocell' to 'photoresistor' and
also mentions 'photoconductor'.
http://en.wikipedia.org/wiki/Photoresistor

doctorj wrote: [quote=Idlewild]Photocell.

AKA:
'Photocell' is new to me; I'd heard it called 'light-dependent resistor (LDR)'.
Wikipedia redirects 'photocell' to 'photoresistor' and
also mentions 'photoconductor'.
http://en.wikipedia.org/wiki/Photoresistor

You say "ham", I say "cappicole"........