Three different size for this series track light,including 20W, 45W and 50W, made by die-cast aluminium， surface powder coated in white ,black or silver; COB (Chip on Board) technology for maximum efficiency; no multiple shadows; energy-efficient LEDs with very good colour rendering; binning initial ≤ 3 MacAdam; available in the light colours 3000K and 4000K; CRI ≥ 90; min. 80 % of the luminous flux after 50000 hours; BO 70 BASIC: high quality aluminium reflector with spherical facet finish; high-gloss anodised; precise radiation characteristic with four different beam angles; installed and exchanged without tools; adapter for toolless insertion or movement on a variety of 3-phase power tracks; optional DALI