A light is an open system. It runs on electricity, which enters the light from outside, and it emits light, which leaves. Energy is both entering and leaving the system all the time (at least, when the light is on).
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A closed system does not let any matter enter or exit, and no energy enters or exits the system.
open: matter and energy can pass freely in and out closed: only energy can pass freely isolated: nothing can pass freely
The light bulb is a closed system: no mass transfer.
lanceAn open system is a system which continuously interacts with its environment. The interaction can take the form of information, energy, or material transfers into or out of the system boundary, depending on the discipline which defines the concept (see below). An open system should be contrasted with the concept of an isolated system which exchanges neither energy, matter, or information with its environment.a closed system is isolated from environmental influences. In reality completely closed systems are rare.
A battery-operated wrist watch is a closed system. A wind-up wrist watch is an open system.