The light stays on for 6 seconds and then turns off for about a second. They service the bulb once a year. It turns on when it gets dark. On average it will be on for say 12 hours a day - it clearly wasn't properly dark when I took the photograph. In one hour it would be on about 500 times so in a year that would be on over 2 million times. LED must be able to cope with a lot of switching without being damaged.
