Why could blow a bulb?

Good day, I have over the tank is a bulbevery month, the light bulb in the lamp explodes:
Two lamps from such explosions has failed. Changed everything: lamps, extension cords, firm bulbs.
Because of what it could be and whether the moisture so affected?
June 10th 19 at 15:21
1 answer
June 10th 19 at 15:23
well you have the same response to the photo

on the lamp the water is not affected, but the contacts...

short - sharp heating - electric arc - KABOOM

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