Biro Circle Ring LED ceiling light, height 10 cm, with ballast, switchable An aluminium ring and an opal white plastic cover for optimum light distribution - that's the Biro Circle Ring LED ceiling light. Its name reflects one of its many areas of application - the office. It can be used as a light source in many other commercial and private rooms and is equipped with a switchable ballast - with rotationally symmetrical deep-wide 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