If the lamp cap is a standardised type also used with filament lamps, then as from stage 2, the lamp shall comply with state-of-the-art requirements for compatibility with equipment designed for installation between the mains and filament lamps.
Kui lambil on standardne, ka hõõgniitlampide puhul kasutatav sokkel, peab see lamp alates 2. etapist vastama ka võrgu ja hõõgniitlampide vahele ühendatavate liiteseadistega ühildumise ajakohastele nõuetele.