Tobias Grau’s XT-A series pioneers fresh, minimalist form with the most sophisticated LED lighting. Our patented OSA technology features gridded LEDs in an open system, providing advanced efficiency and superior glare-free lighting. XT-A ROUND CEILING luminaire is ideal for open office and common area illumination. The light is height-adjustable from a drop of 40 cm to 300 cm. Light is neutral white (3500 Kelvin, CRI > 80), with both direct and indirect distribution.