I would imagine that it has a day/night sensor that will NOT allow it to come on during daylight. so, your only burning the light at night and then if it sensored so.
Could the line to that light not carry electricity due to a breaker or switch?
I would check my breaker box, make sure that the light is NOT controlled by a switch and if so, turn it on or maybe even off.
These lights will last quite a long time. Are the bulbs still good? Have you tried them?
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