Physics Lab Equipment

LLE-1 Low Pressure Mercury Lamp

LLE-1 Low Pressure Mercury Lamp


  • Ground glass & diaphragm supplied

  • Output of 20 W

  • Housing, support & power supply included

  • Height of lamp adjustable with post/post holder


A low pressure Mercury lamp is one of the most popular discharge lamps in labs, frequently used for wavelength calibration of optical measuring instruments and as a disinfection lamp to sterilize workspace and tools used in biology labs and medical facilities. High efficiency and good color rendition make this type of traditional lamp an ideal source for various applications. Low pressure Mercury lamps use Mercury in an excited state to produce light. The arc discharge is generally confined to a little fused quartz tube mounted within a larger borosilicate glass bulb. As the main arc strikes Mercury, the gas heats up and the pressure increases. The brightness of the lamp increases with an increase in gas pressure until it reaches a steady state.

Spectrum of low-pressure Mercury lamp

Spectrum of low-pressure Mercury lamp


Wavelengths in Visible Range577 nm, 579 nm, 546.1 nm and 404.7 nm
Power20 W
Operating Voltage20 VAC
Operating Current1.3 A
Base TypeE27
Dimension of Bulb28 mm in OD, 155 mm in length
Dimension of Housing50 mm (dia), 195 mm in length
Dimension of Windows2 opposite windows: 30 mm (height) x 16 mm (width)
Range of Height Adjustment150 mm to 260 mm

Part List

Mercury bulb1
Housing with base and post1
Power supply1
Window barrier1 ground glass, and 1 metal plate with a pin hole
Power cord1

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