This is a branded 849mm 21w T5 Shatterproof Fluorescent tube, available in all colours from 2700k (Extra Warm White) to 6500k (Daylight) The High Efficiency 21w T5 tube has an average life of 30,000 hours and an A-class energy efficiency rating. Also boasting a lumen output of 1900 lumens. These T5 tubes are covered with a heat sealed coating that is used to prevent high risk solutions within any industry The T5 tubes are suitable for all stores, warehouses, factories and other large industrial sites as well as public buildings and spaces. Dimensions: 849mm (L) x 16mm (D)