Low Pressure Mercury Lamp Emission Spectrum

Low pressure mercury lamps emit sharp bands primarily at 185 and 254 nm.

Low pressure mercury lamp emission spectrum.

Aquafine standard low pressure lp and amalgam low pressure lp lamp spectrum. Low pressure mercury vapor lamps are a highly efficient source of uv light particularly short wavelength uv light 254nm and 185nm. The emission of low pressure mercury lamps exhibits a characteristic optical spectrum with pronounced spectral lines mostly in the visible and the ultraviolet spectral region but partly also in the infrared. Often called germicidal or ozone absorption lamps they are very stable light sources.

Aquafine lp lamps are considered to be monochromatic or single peak output lamps. Only the light at 253 nm is usable unless synthetic quartz is used to manufacture the tube as the line is otherwise absorbed. There is not emission in the ranges uv b and uv c and also in the visible spectrum the emission is minimum. Strong emissions occur in the 350 380 nm region at which typical uv photoinitiators absorb.

These types of lamps are available in ozone producing and ozone free quartz with a variety of phosphors. Sodium vapor low pressure bright orange yellow. The blue green tint of mercury vapor lamps is caused by the strong violet and green lines. Widely used in sodium vapor lamps.

Due to this characteristic emission spectrum these lamps are not suitable for laboratory photo oxidation studies klan and wirz 2009. The five well known emission lines of mercury hg at 405 436 546 577 and 579 nm are clearly visible. Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. Uv led 365 385 395 405nm spectrums compared with spectrum of uv mercury traditional lamp.

Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed. The power density and the radiance of the emitted light are relatively low. The visible spectrum is not very spectacular. Lp lamps operate at about 40 c and have one useful disinfection output peak at 254nm.

Line spectrum of mercury vapor. Facts about aquafine standard low pressure lp lamps. The latter two yellow lines not resolved by. 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.

In medium pressure mercury vapor lamps the lines from 200 600 nm are present.