[TwistedWave]

It is possible to purchase a small USB lux meter:

http://www.yoctopuce.com/EN/products/usb-environmental-senso...

I use one to automatically adjust the brightness of my Dell display.

[tobyhinloopen]

what display and how do you control your display from your PC?

[TwistedWave]

I have a Dell P4317Q, a great 43 inch display, and control it from my Mac with ddcctl: https://github.com/kfix/ddcctl