Based on laser protection cells, häwa manufactures completely light-tight machine racks. Overlapping surfaces, additional sheets and flanged edges as well as special seals to refract the light are solutions for this kind of application. In case of scattered light, the cover panels can be continuously foamed with PU seal and the internal cells are coated in matt black to prevent annoying reflections. These X-frame machine racks are used in welding and bonding plants to prevent UV light, which is harmful for the eyes, from escaping. Another application field are racks for optical measurements.