Suitable for use as a floorlight or rooflight. Maintains the visual appearance of R254/B191 but with additional 50mm thickness provides increased clear spans up to 3190mm when installed as a floorlight for pedestrian loadings of 5KN/M². Contains 190 x 190mm glass blocks set into reinforced concrete ribs which are spaced at 254mm centres with an overall panel thickness of 150mm. Weight – 239kg/m². In the interest of safety we recommend that when used as a floorlight, the glass lenses are sandblasted to the top surface to increase slip resistance.