Surface mounted luminaire for ceilings or walls. Optional: Direct light distribution or direct light distribution with indirect lighting corona. Opal diffuser made of frosted methacrylate for enhanced light transmission and uniform illumination. Extruded aluminum housings without visible seam (L330-L900), finishes: white (RAL9003) or silver (RAL9006) powder-coated. Direct version: One-step switched or 1-10V dimmable, Direct/indirect version: Switched together or 1-10V dimmable together. Evenly spaced premium LEDs provide uniform illumination combined with highest efficacy standards. Factory-programmable drivers offer 2 standard output levels. Standard color temperature: 3000K, 3500K or 4000K. CRI>80. On request: Wide range of special color temperatures (2700K-6500K), special surface colors, CRI>90. 5-year warranty on all electrical parts. 80% of initial light output for 50,000 hours. Direct access to integral drivers and LED circuit boards ensures hassle-free installation and maintenance. cETLus listed.