>> So where does all the light go in a DLP projector when you display a 
>> black image?
>
> It gets reflected the other direction, into blackness inside the 
> projector. The trick is, the tiny moving bits where it's focused aren't 
> absorbing it, but rather the big heat-sink with the cooling system (for 
> movie projectors) or fan (for little projectors).

I guess in movie projectors it's more of a problem, but in office projectors 
I doubt enough heat is generated to affect the cooling design when there's a 
huge inefficient light source pumping out heat a few cm away.

Anyway, I guess you can always mount the absorbing imager onto a heat sink 
with some air flow if you really need to.

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