Starmer & Lammy A Marriage Made In...
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No best answer has yet been selected by sarahbowen82. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Answer #2 above is on same track as my answer.
If I read your question correctly; you have fitted a security light which is now permanently 'On'.
Try switching the power off for two or more seconds, it should then activate properly when power is restored. The lamp will light when the power is restored but should go off, if you have it on the right setting.