>> Also, are *human eyes* linear? Would you notice when brightness is 
>> changing
>> perfectly linearly? :)

Hehe no probably not, anyway I highly doubt a filament lamp is linear 
brightness wrt voltage either - for starters the temperature of the filament 
probably has something to do with the power (which is proportional to V^2), 
then the brightness of a black-body is probably not very linear wrt 
temperature...

> Probably not. But when the light stays off, and then suddenly turns full 
> on, with nothing in between, I'm fairly sure that's non-linear. ;-)

That's how LED works (they're diodes!), at a certain voltage suddenly they 
start conducting very well.  It's like they are a very low resistance 
resistor, but you need to apply some "offset" voltage to get them conducting 
first.  Thus the difference between applying 2.0V and 2.5V could be the 
difference between no light and blowing the LED!

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