Reminds me of a joke.
A Red Sox and Yankees fan are having lunch. The Red Sox fan pulls out a thermos of soup. The Yankees fan asks, "what's that"? The Red Sox fan says, "A thermos. It keeps hot stuff hot and cold stuff cold." The Yankees fan asks, "how does it know"?
The icecap just knows. It drives 48" bulbs at 80 something watts. No dials.