When a CFL fits into a light fixture designed for an incandescent bulb, it is termed as what?

When a compact fluorescent lamp (CFL) fits into a light fixture that was originally designed for an incandescent bulb, it is referred to as an integrated CFL. This term indicates that the ballast, which is necessary for the operation of the CFL, is built directly into the lamp itself. As a result, it can easily replace the incandescent bulb without requiring any modifications to the fixture or additional components.

Integrated CFLs are designed with this convenience in mind, providing users with a seamless transition to a more energy-efficient lighting solution. In contrast, non-integrated CFLs require a separate ballast to operate and are not intended to fit in standard incandescent sockets without modifications. The correct term emphasizes the simplicity and direct compatibility of the integrated CFL within existing light fixtures.