security light stays on?

I have exactly the same problem.
I bought 2 security lights from B&Q, I've already had to replace one of the lights as it either stayed on or just kept turning on and off randomly.
Now the second light appears to have a fault (STAYING ON AGAIN), so I guess I'll have to replace this one now.....
Not good enough when you think these lights are less that 6 months old...

Central.fm
December 2009

It sounds like a faulty unit. The only thing you can try is to switch it off at the main switch, clean the sensor and surrounding bits with a stiff paintbrush, and remove all cobwebs and crud. You can clean the sensor window with cotton buds and window cleaner. You may have to remove spiders and woodlice, as they seem to enjoy living in these lights. It this doesn't work, get an electrician to replace the unit. Unfortunately in my experience, these sensor lights do not have a long life.

Stooby
December 2009