Abstract: A germicidal ultra-violet lamp (UVGI Lamp) fitted with a fluoro-polymer sleeve, sealed on each end and loose over the body of the lamp, thereby providing a thermal barrier for more efficient operation of the lamp in colder temperatures. Specifically, the invention is an insulated germicidal ultra-violet lamp (UVGI Lamp), a thermally insulative and UV transmissive sleeve (such as a fluoro-polymer like PTFE or FEP) of greater diameter than the translucent body disposed coaxially with the translucent body forming an encapsulated space therebetween filled filled with gas, such as ambient surface air. The cathodes can be UVc emitters and can UV light <255 nm. An additional feature of the present invention can be a spacer disposed within said space, wherein the distance between said translucent body and said sleeve is maintained.

Abstract: A device which consists of a germicidal ultra-violet lamp (UVGI Lamp) fitted with a flouro-polymer sleeve, which is heat sealed on each end of the lamp but not allowed to seal over the body of the lamp, thereby providing a thermal barrier for more efficient operation of the lamp in colder temperatures. The UVGI is used for disinfecting surface and airborne mold and bacteria, within the line of sight of the light emission of the device and typically placed in air handlers, air conditioning units, air purifiers, or other devices used to move, transport or purify air, water or other fluids.