Philips TUV 25W G25T8 ultraviolet lamp. Length – 451mm. Base – G13. Used for Air and Water Disinfection in Private Water Supplies, Air Conditioning and Pond UV Filters. Philips TUV 25W G25T8 data sheet We can also supply Osram and Ledvance equivalent lamps. Osram 25 watt uv lamp Ledvance 25 watt uv lamp We also stock replacement quartz sleeves which are supplied with 2 x “O” Rings to ensure a watertight seal. The most popular size quartz sleeve is 415mm x 30mm Open. Quartz Sleeve – 415mm x 30mm Open We recommend changing your Quartz Sleeve after 2 years because the glass will become discoloured over time which blocks out useful uv-c light.