Mercury vapor conducts electricity completing the circuit.
Mercury vapor lamp uv spectrum.
The blue green tint of mercury vapor lamps is caused by the strong violet and green lines.
Unlike most other uv sources the medium pressure lamp mpl has a polychromatic spectral distribution from 190 nm up to the infrared spectrum.
High pressure mercury lamps installed at most fluorescence microscopes are not suitable because they do not emit the short wavelengths needed for this lithography.
Current is limited from the power source to protect the lamp and supply wiring.
Lightsources and strategic partner lighttech manufacture a low pressure mercury lamp lp hg lamp that provides highly efficient short wavelength ultraviolet energy.
Ultraviolet light emitting diode uv c led lamps emit uv light at selectable wavelengths between 255 and 280 nm.
As they strike mercury atoms a mercury electron is liberated at a frequency representative of mercury s spectral line which is 253 7nm.
Our lp hg lamp converts forty percent of the electrical power into uvc radiation for germicidal applications.
These lamps are usually low pressure mercury vapor lamps.
In low pressure mercury vapor lamps only the lines at 184 nm and 254 nm are present.
The usual means of generating uv c for disinfection is most typically with a mercury vapor lamp that produces light through use of an electric arc through vaporized mercury.
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Line spectrum of mercury vapor.
Uv spectrum in medium pressure mercury lamps a plasma that emits uv light is generated by applying electrical voltage.
The dominant emission 90 from these lamps is uv c energy.
Lamp output in the uv range depends on the amount of mercury and vapor pressure of mercury in the lamp.
Often called germicidal or ozone absorption lamps they are very stable light sources.
When the mixture is energized excited it creates a glowing plasma of electrons that pass through the mercury vapor.
The distribution of energy over the wavelength ranges is depicted on the left.
These types of lamps are available in ozone producing and ozone free quartz with a variety of phosphors.
As the arc temperature rises mercury in the lamp converts to a gaseous vapor state.
It is important to use a lamp that emits uvc also termed far uv deep uv or vacuum ultraviolet vuv.
Pulsed xenon lamps emit uv light across the entire uv spectrum with a peak emission near 230 nm.
