Germicidal lamp

Germicidal lamp is a special type of lamp which produces ultraviolet (UV) light. This short-wave ultraviolet light disrupts DNA base pairing, causing formation of pyrimidine dimers, and leads to the inactivation of bacteria, viruses, and protozoa. It can also be used to produce ozone for water disinfection.

Types of Germicidal Lamps

There are three common types of germicidal lamps available in the market: low pressure lamps, medium pressure lamps, and Light Emitting Diodes (LEDs).

Low Pressure Lamps

Low pressure lamps are similar in construction to a standard fluorescent lamp. They have a broad spectrum of emission that includes both germicidal and non-germicidal wavelengths. The UV output is 253.7 nm, which is near the maximum germicidal effectiveness curve.

Medium Pressure Lamps

Medium pressure lamps have a broader spectrum of UV light. This type of lamp is used in a variety of applications, but due to its high power consumption and heat output, it is less commonly used for direct germicidal application.

Light Emitting Diodes

Light Emitting Diodes (LEDs) that produce UV light are also becoming more commonly used for germicidal applications. They have a long life and are more energy efficient than other types of lamps.

Applications

Germicidal lamps are used in various applications, such as water treatment, air purification and surface sterilization. In addition, they are used in laboratory and medical environments, food and beverage protection, and many other applications.

Safety

Direct exposure to germicidal UV light can cause injuries to the skin and eye. Therefore, such lamps are usually fully enclosed and can only be switched on when these enclosures are closed.

See Also

• Ultraviolet light
• Disinfection
• Sterilization (microbiology)

References

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