I've mentioned before about how chilly it is in my little cubical.
I must report that after days of informally watching the refrigerator thermometer in on my padded wall, I have come to the conclusion that when it's "just under" 74°F - I'm comfortable.
Any lower & I get chills from the downdraft over my head.

I think it's time to update my owners manual....

Jason De Arte, Optimal Operating Environment, Sitting at a computer in a cubical farm
Ambient Temperature Range: 73°F - 79°F
Light Source: Indirect, no fluorescents
Maximum Lumens: ???
Minimum Lumens: ???

I know I like it dim, but I just don't feel retentive enough to buy a light meter.
Hmmm... I wonder if I could write up a little app to use my web cam as a light meter? Then I would have to buy a light meter so I could calibrate it. ;-)