How does a push-to-test light differ from a regular indicator lamp?

A push-to-test light is designed specifically to allow a user to check its operational status easily. When the button is pressed, it illuminates to indicate that it is functional. This feature is not commonly found in regular indicator lamps, which typically light up in response to a specific condition in an electrical circuit without any manual testing.

The differentiation in terms of color lens often enhances visibility or communicates specific statuses (like red for faulty or green for normal). This functional purpose aligns with the design of push-to-test lights to provide immediate feedback, thus making the color lens a distinguishing attribute when compared to regular indicators.

While additional functions, different voltage requirements, or size may describe other characteristics, they do not uniquely capture the primary functional distinction of a push-to-test light, which is its ability to be manually tested for operational readiness.