This is a GE 8 Watt 302.5mm T5 Tube in standard white (535). This T5 Mini Tube/lamp has an average life of 5,000 hours and has a B class energy efficiency rating. Often found in emergency bulkheads due to their energy efficiency and long lamp life. This is a market-leading brand and one of the best F8w T5 tubes available. Ideal replacement for any branded 8w T5 type tube. We also sell the emergency batteries used in maintained/non-maintained emergency bulkheads (see related products)