IEC TR 63037:2019(E) specifies the electrical interface between phase-cut dimming equipment and lighting equipment, such as LED integrated lamps and light sources with external controlgear, with the intention of helping designers of both types of equipment to develop products that will work together properly. This document describes both the dimming phase and the off phase. In addition to the specification of the interface, test procedures are given for testing the proper operation. It may be expected that controlgear fulfilling the requirements of this document are also suited to be used with electronic switches that use a circuitry comparable with that of a phase-cut dimmer, but do not contain means for the adjustability of the phase-cut angle. Safety requirements are not covered by this document, but by respective product standards.