Right around 1900 the mercury arc rectifier was developed this luminous device was very important for power conversion.
Low pressure mercury lamp voltage.
A sodium vapor lamp is a gas discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm.
Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c.
Low pressure and high pressure low pressure sodium lamps are highly efficient electrical light sources but their yellow light restricts applications to outdoor lighting such as street lamps where they are widely used.
Again transition of the electrons requires least amount of input energy from a colliding electron.
The most common form of germicidal lamp looks similar to an ordinary fluorescent lamp but the tube contains no fluorescent phosphor in addition rather than being made of ordinary borosilicate glass the tube is made of fused quartz or vycor 7913 glass.
Low pressure mercury lamps are very similar to a fluorescent lamp with a wavelength of 253 7 nm 1182 5 thz.
They have a germicidal efficiency of 30 and can operate on lower current between 180 and 425ma.
It needs to be vaporized and ionized before the lamp can produce its full light output.
Open circuit voltage must be high enough to start and sustain the particular lamp type.
A neon lamp also neon glow lamp is a miniature gas discharge lamp the lamp typically consists of a small glass capsule that contains a mixture of neon and other gases at a low pressure and two electrodes an anode and a cathode when sufficient voltage is applied and sufficient current is supplied between the electrodes the lamp produces an orange glow discharge.
In case of fluorescent lamp the mercury vapour pressure is maintained at lower level such that 60 of the total input energy gets converted into 253 7 nm single line.
Low pressure lamps have working pressure much less than atmospheric pressure.
At room temperature 250 volts dc is usually sufficient for low voltage 135v types while 325 volts dc will be needed for high voltage 265v types 135v 265v.
Two varieties of such lamps exist.
Designed by experienced engineers and by using quality material in combination with a tightly controlled manufacturing process we provide high quality lamps free of impurities to maintain strong and stable output throughout life of the lamp.
Gilway technical lamp engineering catalog.
These early low pressure lamps used a lot of mercury today s lamps use a tiny amount of mercury.
To facilitate starting of the lamp a third electrode is mounted near one of the main electrodes and connected through a resistor to the other main electrode.
For example common fluorescent lamps operate at a pressure of about 0 3 of atmospheric pressure.
In addition to the mercury the tube is filled with argon gas at low pressure.
As pressure increases the chance of multiple collisions gets increased.
Softglass lamps are one of our quality low pressure mercury lamp products.
Nyc subways were still using original mercury arc rectifiers to convert ac to dc power up until the end of the 20th century.
