Series: KALEEA BASIC Lay-in luminaire for ceiling systems with visible mounting rails. Housing made of sheet steel, powder-coated. Luminaire frame: aluminium, powder-coated. Diffuser plastic (PS) microprismatic. LED backlight technology for homogeneous illumination of the entire light-emitting surface. Suitable for Lay-in luminaires. MultiColour: Colour temperature individually adjustable either 3000 K or 4000 K. Factory setting 4000 K. MultiLumen: Luminous flux adjustable in 4 steps. Factory preset to lowest luminous flux. External driver. For office areas and environments with computer screens in accordance with EN 12464-1. Colour: white Length: 595 mm Width: 595 mm Cut-out length: 575 mm Cut-out width: 575 mm Recess height: 160 mm Luminaire: recess height: 30 mm Lamp: LED Socket: without socket Colour temperature: 3000K, 4000K Colour rendering index (CRI): 80 System power: 21 W Rated luminous flux: 2900 lm Beam angle Down: 83° / 87° Luminous efficiency: 138 lm/W System power 2: 25 W Rated luminous flux 2: 3400 lm Luminous efficiency 2: 136 lm/W System power 3: 29 W Rated luminous flux 3: 3900 lm Luminous efficiency 3: 134 lm/W System power 4: 32 W Rated luminous flux 4: 4350 lm Luminous efficiency 4: 136 lm/W Control gear: Regulated power supply Protection class: II Type of protection: IP 40