OptiLight is the new brand on the roof window market, offering a high quality product at an affordable price. The modern technology of woodworking and preparation of raw materials, the quality control at every stage of the production process and quality tests carried out by independent laboratories are a guarantee of high quality in OptiLight roof windows. Thanks to the applied industrial design of the metal cladding parts, the OptiLight gains modern and attracive look. High-quality wood. Wooden elements of the OptiLight windows are made from especially sorted, highest quality pinewood which is bonded in layers, impregnated, and coated with an ecological acrylic finish. The wood is protected on the outer surface with weather and UV resistant aluminium profiles. Thermally insulated glazing unit. The window has a large effective glazing area, which allows more light to enter the room. All windows are double glazed, and use a single chambered construction and acoustic properties, while the U coefficient of the pane is 1.1 [W/mK]. Space between panes is filled with inert gas. The internal pane is coated with a heat reflecting low-emission layer, externall glass toughend. It helps to reduce heat loss during winter and overheating during summer. The air inlet. The air inlet of OptiLight V type efficiency is up to 20 [m/h]. It is the air quantity, which flows into the room through the window with 78cm or 114 cm width and pressure difference of 10 Pa. Windows with 78cm width and bigger have in the air-inlet slat 2 openings. In windows with 55 and 66 cm width, air-inlet efficiency will be respectively lower and is 15 [m/h]. The windows with 55 and 66cm width are equipped with air-inlet slat with one opening. The convenience of use. OptiLight windows have a centre-pivoting construction. The hinges installed in the middle of the window allow the sash to be opened in a range of positions and to be rotated up to 180 degrees. The handle design enables tight closing and two positions of micro ventilation. The handle positioned at the bottom of the sash makes using the window easier and more comfortable, irrespective of the height at which the window is installed. Pivot structure and functional handle placed in the bottom part of the sash ensures comfortable use and operation. The wide range of applications. Thanks to the construction of windows and flashings OptiLight windows can beinstalled on roofs at any pitch between 15 to 90 Degrees.