Low Pressure Mercury Lamp Voltage

In addition to the mercury the tube is filled with argon gas at low pressure.

Low pressure mercury lamp voltage. 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. Right around 1900 the mercury arc rectifier was developed this luminous device was very important for power conversion. They have a germicidal efficiency of 30 and can operate on lower current between 180 and 425ma. Gilway technical lamp engineering catalog.

Low pressure mercury lamps are very similar to a fluorescent lamp with a wavelength of 253 7 nm 1182 5 thz. Fluorescent lamps a heated cathode lamp the most common lamp in office lighting and many other applications produces up to 100 lumens per watt. 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.

Again transition of the electrons requires least amount of input energy from a colliding electron. 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. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c. Nyc subways were still using original mercury arc rectifiers to convert ac to dc power up until the end of the 20th century.

Two varieties of such lamps exist. These early low pressure lamps used a lot of mercury today s lamps use a tiny amount of mercury. It needs to be vaporized and ionized before the lamp can produce its full light output. Low pressure lamps have working pressure much less than atmospheric pressure.

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. Softglass lamps are one of our quality low pressure mercury lamp products. 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. 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.

The lamps come in both standard and high output selections and are ozone free. As pressure increases the chance of multiple collisions gets increased. For example common fluorescent lamps operate at a pressure of about 0 3 of atmospheric pressure.