Plasma lamp

A microwave lamp is a special type of gas discharge lamp. Its special feature is the electrodeless design, similar to a Nullode, and the energy supply in the form of microwave radiation.

Operation

The microwave lamp consists of a low pressure with inert gas filled quartz glass ball or bulb, which is coated with metal halide salts. By microwave (typically, 2.45 GHz frequency ) from a magnetron is mentioned in the ball, and the burner, a plasma is generated by the rare gas filling becomes ionized. The plasma causes the metal halide evaporated. Common noble gas plasma and metal halide now emit light of a broad spectral range.

The light spectrum can be changed by doping the coating. With an indium bromide coating a bright midday light is intended to provide appropriate light color of 6500K.

Other properties

By changing the power of the magnetron microwave lamps are dimmable well, their color spectrum remains stable. The color rendering index of microwave lamps is up to 95 The technology is scalable; The light yield is up to 120 lumen / watt, with a light flux of up to 20,000 lumens can be achieved. The life span of the bulb is located at 8000 up to 30,000 hours.

Due to the high luminous flux, the lamps are sometimes not placed directly on site. Instead, the light is guided by means of light guides in the space. This makes this type of lamp maintenance. In industry, microwave lamps are used for curing of paint, coatings or bonds (UV -curing ).

A special form of microwave sulfur lamp is the lamp.