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Turning on and off a light will reduce it's life. A filiment expands when it gets hot and contracts as it cools off. Even if the controller is designed to drop the light to 25% and back to 100% (never turning the lamp totally off), it will still cause extra expansion and contraction that would not otherwise be present in a bulb that was on all the time.

Ever wonder why a standard 120V incandescent bulb usually chooses the time of turn on to flash and die?

I'm not by any means saying that the modulator is junk, because they seem to work well. But, they will decrease a bulbs life some. By how much? I can't tell you that.

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