Screen dimming when moving hand over left speaker??

Hi all
Curious one, I got up early, dragged out the laptop to have a look on web, I turned the brightness down to one notch (F1) I found that if I put my left hand 1 inch above the left speaker (yea that's right not touching anything) and move my hand left and right, then screen goes dimmer then brighter then dimmer and so on?
Any thoughts... got me stumped?
MBP 2GB, 1.83 version 10.4.10
Cheers ears
Az

Well... I do understand why they did it.
Granted, the sensors should not be in the top case; bad design. I've never triggered the dim while typing, but I do get fluctuations depending on what's on the screen itself whenever I work in a dark room. I'll open a browser, for example, and my whole screen will go from my dark background picture to an empty white browser window. The flood of backlighting is enough to trigger the sensors.
If the sensors were better-placed, this would be a great feature as overly bright screens in a dim room cause eye strain and are an unnecessary battery drain. Too bad the sensors don't give the OS reliable info.
Ciao for now, Joel

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