Panel luminaire type M2-R for Ceiling recessed mounting, Length 622mm and width 622mm, colour WH - White, LED light source, lumen out 4277lm, LED driver type DALI DT8: Dimming (CCT/Tuneable white), colour temperature 2700 Kelvin, to 6500 Kelvin, and CRI >80, Optic type OP - Opal diffuser,