CoeLux HT25, the first of the CoeLux systems characterized by a zenithal beam of light with a versatile design: 25 cm thick for a rectangular window measuring 52 by 107 cm. It allows great design freedom, its distinctive 25 cm thickness is suitable for recessed installation even in smallheights, in plasterboard false ceilings or modular ones. It can be installed in different compositions and the subtle design of the frame facilitates the creation of semi-continuous windows, creating the perception of large portions of sky. Moving around the area below the system, the observer will be able to see a large portion of sky and by approaching and entering the emitted spot the sun will appear, slightly diffused and not very dazzling. The optical design helps to create the sun perceived at infinite distance and the observer, moving in space, will have the impression that the sun is always positioned above his head. The sun of CoeLux HT25 illuminates and projects a beam of intense light, enhancing the colours and the textures of the room and the objects in it. The spot projection is slightly wider than the window and illuminates the surrounding area diffusely. With a 60 degree flaring, the thin, opaque white frame intercepts the sun and creates a reflection on the sky, increasing the perception of depth of the window. The HT25 system is characterized by the CoeLux panel made of scratch-resistant and fireproof glass: the nanoparticles inside diffuse the light, recreating the blue colour of the sky. The system can be dimmed from 40% to maximum power, it is DALI compatible and can be controlled via Bluetooth from a smartphone upon request.