On a recent trans-Pacific flight, I was doing some work on my Macbook. All was fine with the in-flight WiFi working pretty well. But when they turned off the lights after dinner, my screen was painfully bright-even on it’s lowest setting.
You can use shift-option-F1/F2 to gain some fine-tuning control over your screen’s brightness, but if you need more, there’s Shady – a tiny li’l utility that basically writes a variably transparent grey layer over your screen. That’s all. It’s great. Get it.