The lamp post

I became curious. Why the light in this lamp post is not as bright as the rest?

I was walking toward our block and I can spot the difference at a distance. In a row of ten lamp posts, this one is obviously dimmer than the rest. It became clearer to me when I stood directly under the lamp. There were dead insects piled up inside the glass cover. How did the insects get there? It puzzled my mind because it was sealed.

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