An incandescent light bulb offers high repeatability and optical design flexibility due to the nature of its glowing tungsten filament. The incandescent light bulb (sometimes known as the electric lamp or light globe) uses a glowing wire filament heated to white-hot to generate light (a process known as thermal radiation or incandescence). The filament is generally made out of Tungsten and is heated by passing an electrical current through it. Because the filament acts as an electrical resistor, the electrical energy is transformed into heat and light.

Zorn exploits the nature of Tungsten to develop light bulbs which are ideal for precision applications demanding a very accurate optical repeatability, colour temperature, extreme brightness or long lifetime.

The filament is housed in a glass enclosure. The purpose of this enclosure is to keep the filament in a near-vacuum, noble gas, or a halogen gas atmosphere.

The correct choice of glass material and atmosphere is also essential to the correct development of a bulb for a specific purpose. All three atmospheric options are however linked by the common goals to prolong the lifetime of the bulb and/or increase its brightness, by reducing the rate at which the filament material evaporates.