Lysboks

Lysboks, the Norwegian term for a lightbox, is a device that provides uniform illumination behind a translucent panel to enable viewing, tracing, or reproduction of images. Lightboxes are used in fields such as photography, graphic design, art restoration, medical imaging, and signage.

Construction and operation: A lysboks consists of a hollow enclosure housing a light source and a diffuser or light-guide panel. Historically, fluorescent tubes were common; modern units typically use LEDs for energy efficiency and even brightness. The front panel is made of frosted glass, acrylic, or polycarbonate to spread light evenly. Most models offer adjustable brightness, and some allow color-temperature control or interchangeable diffusers and backplates. Power may be supplied from mains electricity or via USB in compact consumer models.

Applications and usage: In photography and graphic design, lysboks are used for tracing sketches, viewing and evaluating film negatives, and checking color accuracy under a consistent light source. In art conservation, they aid in comparing underlying drawings or restoring details. In industry, lightboxes can illuminate signage, displays, and backlit samples for inspection.

Variations: There are desktop, portable, and wall-mounted designs, with sizes ranging from small A4 or letter-sized panels to large studio installations. Some specialized boxes include UV filtering, anti-glare screens, or reflective backings to enhance contrast. Safety considerations include avoiding direct viewing at high brightness and proper disposal of old fluorescent tubes.

See also: Lightbox; Backlit display; Tracing table.