G25T8 25W Germicidal UV-C Light Bulb Replacement Lamp
G25T8 25W Germicidal UV-C Fluorescent Lamp, Replacement Light Bulb

About 17.75" long including the pins and 17.19" excluding the pins.

Osram $10.23 Each - 404 Remaining In Stock

GE with Cover Guard $14.23 Each - 171 Remaining In Stock

You can also order the ballast to wire one or two G25T8 lamps, the ballast to wire two or three G25T8 lamps and the T819 Sockets.

Germicidal Lamp Handling Warning

Lamps ordered will generally be shipped the next business day by USPS Priority Mail or UPS, check here for Shipping Information. Large orders may qualify for a discount and may not qualify for next day shipment. If you do not know what lamp you require or for lamps not listed, email your request or call 336-882-2854. To order, please use our secure shopping cart or call 336-882-2852 or 800-692-3051. Click to go to our Home Page and View Cart.

Wattage: 25W, 25 Watt Watts
Voltage: 46V
Amperage: .6A
Glass: T-8, T8 Clear, UV Transmitting Glass
Base: G13 BiPin
UV Emission: 254nm
UVC Output: 6.9W
Maximum Overall Length: 17.2" or 437mm Excluding Pins, MOL 17.875" or 454mm Including the Pins
Filament to Filament Length: 351mm
Average Rated Life: 8,000 Hours
Burn Position: Universal, S180

Lamp emits UV rays of 254nm and can kill most germs and microorganisms. Emits no ozone.

You may need the FG-1E, FS-25 or some other starter. If you replace the lamp and it does not work then most likely you need a new starter. Since starters are inexpensive and shipping is relatively expensive it my be a good idea to see what starter your unit uses, if any as sometimes the starting is a function of the ballast, and add a starter or two to your order.

Occasionally a customer will have a problem fitting in a new G25T8 lamp. While the maximum overall length is 18" the lamp can be a little shorter. If your equipment is adjusted for a tight fit with a lamp shorter than the new lamp it may be difficult or impossible to install. Fortunately there is an easy fix. You will find that one of the two socket ends is adjustable. You can loosen the screw(s) holding the socket in place, slide the socket so the opening is slightly wider, retighten the screw(s), and then install the new lamp.

Alternate Part Numbers: Toshiba GL-25, Osram 23355 23355-0, G25T8/OF, SANKYO DENKI, Ultraviolet, 625T8, Sylvania 23376, 23376-0, Puritec HNS, G25W, F25T8/GL, G25T8/0F, Ushio 3000008, GE 72762

Germicidal lamps are clear with special UV transmitting glass. For use in sterilizers and air and water purifiers. This is an ultraviolet C (253.7 nm wavelength) bulb for use in sterilization, water and air purification and surface disinfection. Used in the Forming and Disinfection of Contact Lenses. Used in UV Sterilizers for Fish Aquariums and Ponds. Fixed wavelength spectrophotometer detector. Germicidal lamps allow 253.7nm UV-C radiation from the mercury discharge to pass through the glass thus penetrating and inactivating the DNA of most micro-organisms.

Warning: Avoid direct exposure of eyes and skin under germicidal lamps. To prevent possible serious injury, eyes and skin should not be exposed to direct or reflected ultraviolet power emitted by this lamp. This lamp is in Risk Group 3 per ANSI/IESNA RP-27.3-96. Adequate protection should be provided by clothing, gloves, opaque materials, and ordinary window glass. Although this lamp will operate in standard fluorescent fixtures, it should not be used for general lighting applications.

Go to our Germicidal Safety Sheet for more lamp handling details.
Note: This lamp contains Mercury. Manage in accord with disposal laws. See www.lamprecycle.org.

Germicidal fluorescent light bulbs are most often used with specialty air and water purification systems in hospitals, food handling, and HVAC. Applications include food processing, medical facilities, air conditioning systems, pharmaceutical production, clean room, drinking water, photochemistry, phototherapy, dermatology, wastewater, laboratory/research, and other sterilization and disinfection needs. For use only in fixtures and equipment designed for germicidal lamps.


Coralife 18"


Luminaire Model # 25W 01BC-G25T8-4503

Tropical Marine

Cross reference information is designed to help you find the correct lamp for your application. We do not verify the accuracy of this information. You are responsible for ordering the correct lamp and we make every attempt to help you in that process. We recommend that you confirm the information with the equipment manufacturer before ordering.

800 Burton Avenue, Suite 107
High Point, NC 27262
336-882-BULB (2852)

Order Line: 800-692-3051
Technical Support Line: 336-882-2854
Fax Line: 336-882-2819

Hours: 8 AM to 4 PM EST Monday through Friday

Sales: Address changes, invoice copies, tracking and delivery confirmation numbers, order status, product availability, payment options, shipping quotes, returns, damage claims

Technical Support: Help finding a product not listed, determining the correct lamp for your application, lamp handling and premature lamp failures

International Orders: Large international orders that require special shipping arrangements and quotes

If you have compliments, complaints, suggestions, or help with areas not listed above please contact:

Ron Miller
General Manager