Please make sure you have inserted brand new alkaline batteries into your unit. If you have another set around to test or have had your lights installed and it suddenly stopped working, please insert a new set of batteries. 95% of the time this issue is caused by old or drained batteries. Secondly, try testing your light in a dark closet or room as mentioned in the previous question to make sure that something in the environment is not activating the light. Once you have checked the above items, if the light still does not turn off, please email us and we will respond via email within 24 hours with further instructions.