This is a 600mm x 600mm Recessed Modular 18w Fluorescent Tube Fitting to occupy 4 x 18w Fluorescent T8 Tubes, with all colours available from 2700k Extra Warm White to 6000k Daylight. The CAT2 Louvre ensures there is minimal glare on computer screens, The fluorescent lighting module is ideal use within offices, commercial properties, schools, and other high-specification applications. The CAT2 Louvre ensures there is minimal glare on computer screens. This T8 fluorescent lamp (T26/T25) has an average life of 15,000 hours, which means it will last for many years without needing to be changed and has an A class energy efficiency rating.