Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c.
Low pressure mercury uv lamp spectrum.
Medium pressure lamps produce the greatest uv output per unit length of lamp of the 3 lamp types.
Even though more cleaning may be required for medium and amalgam lamp based systems because they have a smaller number of lamps in the uv unit these systems can.
Charles wheatstone observed the spectrum of an electric discharge in mercury vapor in 1835 and noted the ultraviolet lines in that spectrum.
The german physicist leo arons 1860 1919 studied mercury discharges in 1892 and developed a lamp based on a mercury arc.
Optimum mercury vapor pressure the concentration of mercury atoms in the discharge the mercury vapor pressure must be controlled in order to optimize the conversion of electrical power to uv radiation.
In 1860 john thomas way used arc lamps operated in a mixture of air and mercury vapor at atmospheric pressure for lighting.
These types of lamps are available in ozone producing and ozone free quartz with a variety of phosphors.
Rather than a cold spot the lamp s amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output of a standard low pressure mercury lamp of the same length.
Its humanitarian value has had worldwide success since.
At low vapor pressures the.
Power supplies are.
The lamp will produce its maximum output when the mercury vapor pressure is approx.
Often called germicidal or ozone absorption lamps they are very stable light sources.
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.
Low pressure germicidal lamps have an operating lifetime of up to 12 000 hours and convert up to 40 of the lamp s electrical power into uvc offering an efficient and cost effective alternative to medium pressure mercury lamps for water air and surface disinfection systems as well as controlling unwanted odours in the air.
Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure.
New high power amalgam lamps are significantly more powerful than low pressure lamps.
6 microns 006 torr.
Low pressure mercury lamps are also used as relatively efficient sources of ultraviolet light for applications like uv curing lithography uv spectroscopy solarium ozone generation water sterilization and other germicidal irradiation.
Low pressure mercury vapor lamps are a highly efficient source of uv light particularly short wavelength uv light 254nm and 185nm.
We re exposed to parts of the uv spectrum while outdoors.
