Vertical open wall lamp Kool in striking optics The Kool wall lamp is made entirely of grey cement and follows the trend of the concrete look, which is very popular as an element in the modern interior style. Kool is designed in a rectangular cuboid shape. The two GU10 bulbs are placed in the inner metal holder. Thus, they are visually invisible to the viewer. Their light falls outwards through the vertical openings, creating an up-and-down accent in the form of two light cones.