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Dusk to dawn light permanenly on?

I have a dusk to dawn light. After a brief power cut it now remains on all of the time. Even if i switch it off at the switch!! Only way it goes off is if I flip the fuse on the fuseboard. Any ideas?
Wrawby, August 2013
you dpnt know too much about these lights toptrish it seems :-)

mm, October 2013
some of these sensors have a time unit that if you turn the switch off and on it latches on,and if you turn the swuitch off it reverts to automatic mode

mm, August 2013
yes it sounds like the sensor has latched personally I would switch it off for longer than 20 seconds probably several minutes

toptrish, August 2013
try turning it off for 20 seconds then back on again

mm, August 2013