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Small clear glass tube with metal pins at each end

Ushio

Ushio G4T5 4.5W 6000h UV-C 253.7nm germicidal standard bulb

SKU CH-MBQ6-R1DJ2

A low-pressure mercury-arc germicidal bulb emitting UV-C radiation at 253.7nm for water, air and surface disinfection with a 6000-hour rated life

  • Power rating4.5
  • Lifespan (hours)6000
  • Product typeGermicidal Bulbs
  • UV-C output at 253.7nm targets germicidal applications
  • 5W low-pressure mercury arc delivers efficient sterilisation
  • 6000-hour rated life supports extended operation
  • Special coating maintains high UV output over lifespan
  • Low mercury dose reduces environmental impact

Ushio G4T5 4.5W germicidal lamp

This Ushio G4T5 is a low-pressure mercury-arc lamp that emits UV-C radiation peaking at 253.7nm for germicidal use. It draws 4.5W and offers a rated life of 6000 hours. The lamp suits drinking water, wastewater, air conditioning, pharmaceutical, food processing, packaging, laboratory, photochemistry, clean room and other sterilisation needs. A specially formulated coating maintains high output over the long life.

Practical limits of UV-C mercury-arc output

UV-C radiation at 253.7nm is absorbed by ordinary glass and plastics, so the lamp requires a quartz or UV-transparent fixture. Output depreciates by an average of 20 to 25 percent at end of life, reducing germicidal effectiveness over time. The lamp contains a low mercury dose to meet environmental demands, but still requires proper disposal. It is not a general-purpose light source and must be shielded from direct human exposure.

Installation notes for G4T5 UV-C lamp

The lamp fits standard G4T5 sockets in compatible UV disinfection equipment. Power must be off before insertion and the quartz envelope should be handled with clean gloves to avoid contamination. Oils on the surface can cause hot spots and premature failure. Verify that the ballast and fixture are rated for 4.5W UV-C lamps. Incorrect ballasts or poor ventilation often cause early depreciation or starting problems.

How it compares

Measured against everything we stock in General-Purpose & Specialty Bulbs, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 60% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand nameUshio
Product typeGermicidal Bulbs
Power
Power rating4.5
More details
Lifespan (hours)6000

Questions about this item

Which wattage and lifetime combination suits my disinfection setup?

The lamp draws 4.5 watts and is rated for 6000 operating hours before replacement is recommended.

What does the 253.7 nm peak wavelength mean for germicidal effectiveness?

Radiation peaks at 253.7 nm, the wavelength most absorbed by microbial DNA, delivering strong disinfection for water, air and surface applications.

How does the low-pressure mercury-arc design limit output depreciation over time?

High-purity construction and a specialised coating keep UV-C output stable, averaging only 20 to 25 percent depreciation at the end of the 6000-hour rated life.

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