[heckraiser]

A thermostat is certainly intelligent.

The definition of intelligent I give is “to mitigate uncertainty.” If it does not mitigate uncertainty, it is not intelligent.

It is merely of constrained intelligence. Perhaps your expectations are too broad.

If the thermostat reacts appropriately to environmental changes then it is performing its role intelligently.

[vacuity]

In the context of a person being trapped in a cave, is some aspect of light shining distantly intelligent? It's reducing uncertainty about where a viable exit is, after all.

[heckraiser]

Information is the reduction of uncertainty. If it does not reduce uncertainty it is not information.

Intelligence is the mitigation of uncertainty.

The revelation of the light is information. Navigating the contours of darkness is intelligence.

If the cave walls glowed in response to proximity (of the observer) then the light source would have a modicum of intelligence.