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///some people believe they observe this.
[momentary inital brightening]
But I think it's because the light bulb got to its full brightness
before the irises of their eyes closed down. If the room is not real
bright, and you stare at a bulb as it is turned on, you will have the
impression that it got real bright at first and then dimmed. I think
this is a biological phenomenon in the eye rather than physical reality
in the light bulb. I don't see how the bulb could overshoot the
equilibrium brightness, but I have to admit I have never recorded the
brightness of a light bulb turning on.
Michael D. Edmiston, Ph.D.