Biro Circle Ring LED ceiling light, diameter 75 cm, switchable The lampshade of the Biro Circle Ring LED ceiling light is made of aluminium in the shape of a ring. It is closed at the bottom with an opal white aluminium cover, which ensures optimum distribution of the light emitted. The light is particularly suitable for use in offices, conference rooms and many other commercial areas. The large light is equipped with a switchable electronic ballast and emits powerful light downwards - with rotationally symmetrical deep-wide beam light distribution - optimum light distribution thanks to the opal white plastic cover - general colour rendering index CRI > 80 - service life L70/B50 at 25 °C: 276.000 h, service life L80/B20 at 25 °C: 153,000 h, service life L80/B50 at 25 °C: 153,000 h - housing material: aluminium / steel / plastic - permissible ambient temperature (ta): -20 °C - +25 °C - with electronic ballast, switchable, not dimmable