Series: HB 501 Flat decorative round LED surface-mounted luminaire. Housing: plastic (polycarbonate). Diffuser: plastic (polycarbonate), opal. Base and diffuser are sealed together. MultiColour: Colour temperature adjustable via switching element for 3000 K (factory setting), 4000 K and 5700 K. Quick mounting adapter steel sheet, white powder-coated, with bayonet fastening. Driver integrated. Colour: white Diameter: 400 mm Height: 63 mm Lamp: LED Socket: without socket Colour temperature: 3000K, 4000K, 5700K Colour rendering index (CRI): 80 System power: 25 W Rated luminous flux: 2400 lm Luminous efficiency: 96 lm/W System power 2: 25 W Rated luminous flux 2: 2400 lm Luminous efficiency 2: 96 lm/W System power 3: 25 W Rated luminous flux 3: 2400 lm Luminous efficiency 3: 96 lm/W Control gear: EB Protection class: I Type of protection: IP 40