Most produced and used in the economy of tubular fluorescent lamps, which convert radiation in the ultraviolet range of an electric arc in mercury vapor using a phosphor layer into visible optical. They consist of a glass flask, at the ends of which the legs of the electrodes are soldered. An inert gas is introduced into the flask, which facilitates ignition. Small mercury lamps are manufactured in small quantities and have a reduced mercury content compared to conventional long fluorescent lamps. All fluorescent light sources have a longer life than others.
Mercury lamps are divided into the following types:
-discharge devices for low pressure lighting, which include conventional fluorescent and compact fluorescent;
- high and ultra high pressure discharge light sources, these are, in fact, high and ultra high pressure mercury lamps, metal halide, mercury-xenon and others.
High pressure light source device
High pressure mercury lamps are mostly made in the form of DRL lamps. They have an ellipsoid-shaped glass flask. Built-in tubularquartz burner. It is made of transparent quartz glass. There are four electrodes in the flask. Its inner space is filled with inert gases in strict proportions.
It also contains mercury, which may look like a ball or plaque on the walls of the burner. Instead of air, nitrogen is pumped into the flask. A layer of phosphor is applied to the inside of the glass, which, upon receiving ultraviolet radiation, turns it into visible light. The gas discharge that occurs when voltage is applied is a light source.
Extremely high pressure mercury lamps are arranged in the same way. Their flasks can be coated with a matte or mirror finish. They are equipped with a choke, the purpose of which is to reduce the supplied electric current. Without a throttle, they instantly fail. After applying voltage, mercury lamps gain brightness within six to eight minutes. During the same period, mercury in it passes into a gaseous state. After that, the lamp starts to work in the set burning mode.
Device of arc mercury light sources
This is one kind of gas discharge device for high pressure lighting. They differ from all the others in special additives. They can have warm, neutral and cold light. Arc mercury lamps, in which radiant additives are introduced, or high-pressure metal halide lamps are used for general and special lighting, and are also installed in various devices and devices. These are compactpowerful and efficient light sources that are used in the lighting ramps of railway lines, quarries and other large open areas. They are also used to illuminate stages, studios, industrial buildings, they are used for outdoor lighting of architectural sights. They are used in spotlights with special optics.
