This 60 Watt T9 Circular 400mm diameter Fluorescent Tube emits a Warm White colour temperature. This energy efficient lamp offers excellent colour rendering and stable light output together with an impressive 10,000 hour lamp life. It features a G10q base for easy fixture compatibility and has a frosted coating that enhances light quality. The tube's shape is ring, and it provides a long lifespan. The T9 Triphosphor range features a G10q base. This long-lasting lamp is ideal for functional domestic and commercial applications. Quick Start Technology. Lasts up to 10 times longer than a standard lamp. 400mm x 400mm x 28.5mm. The Bell 60w 830 T9 Circular Fluorescent Tube - Warm White emits 4300 lumens, with a colour temperature of 3000.0K. It offers a CRI of 80.0. This tube is ideal for a range of applications, offering both efficiency and reliability.