OSRAM T5 tube lighting solutions are economical and efficient. With an average life span of about 24000 hours, they help save costs. Appropriate for use in a wide variety of domestic and commercial uses. This efficient OSRAM tube is a base type T5 light and is a 21 Watts lighting tube. With high levels of energy efficiency and economy this is an A certified lighting solution. All T5 lighting solutions are dimmable. The T5 tubes require a starter and an electronic ballast to turn the light on. .(1)Highly efficient and economical. (2)T5 is a good color rendering light. (3)Lifespan of 24,000 hours(4)21W output(5)Offers good lumen maintenance with an average of up to 90% of lumen throughout the lifespan. (6)Suitable for uses in public building, offices, shops and domestic spaces, as well