Your search for "bulb" revealed the following:

Bluonics 55W UV Replacement Bulb 4 Prong for Water Purifier Ultraviolet Light Sterilizer

Bluonics (2pcs) 55W UV Replacement Bulb 4 Prong for our Water Purifier Ultraviolet Light (110W UV uses 2 55W bulbs)

Bluonics (3pcs) 55W UV Replacement Lamp Bulb 4 Prong for our Water Purifier Ultraviolet Light (110W UV uses 2 55W bulbs)

55W UV Quartz Sleeve & Replacement Bulb for our Water Purifier Ultraviolet Light

Bluonics 6W UV Replacement Bulb for Under-Sink Drinking Water UV System, 4-Prong Lamp for RO Add-On or Stand-Alone Point-of-Use Unit

Whole House UV Water Filter System 12 GPM – 55W Stainless Steel UV Light System – LED Indicator & Audible Alarm – for Well & City Water – Includes 2 Extra Bulbs – Bluonics

Whole House UV Water Filter System 12 GPM – 55W Stainless Steel UV Light – LED Indicator & Alarm – Well & City Water – Includes 2 Extra Bulbs, Ballast & Quartz Sleeve – Bluonics

Bluonics 6W UV Replacement Bulbs, 2-Pack for Under-Sink Drinking Water UV System, RO Add-On or Stand-Alone Unit, 4-Prong Lamps

Bluonics 6W UV Replacement Bulbs, 4-Pack for Under-Sink Drinking Water UV System, RO Add-On or Stand-Alone Unit, 4-Prong Lamps

Bluonics Quartz Sleeve for 6W UV Water System, Closed-End Replacement Glass Tube for Under-Sink Drinking Water UV, RO Add-On or Stand-Alone Unit

Bluonics Replacement Filter Set for Well Water Systems String-wound Sediment CTO Carbon Sediment UV Bulb 3pcs 4.5x10 Whole House Cartridges UV Lamp

Bluonics 110w whole house water filter system for well and city water with pre-filter, extra filter set and 2 extra uv bulbs, 4-stage filtration with uv water treatment, triple 20 x 4.5 filters, 1 inch mnpt, 24 gpm

Well Water Filter 55W UV Purifier 12GPM Triple Big Blue 10" with with pre-filter, extra filter set and one extra uv bulb

Bluonics 6W UV Replacement Bulb & Quartz Sleeve Set for Under-Sink Drinking Water UV System, RO Add-On or Stand-Alone Unit

BLUONICS PRO Series 48W UV Replacement Lamp for Whole House Water Filter Systems

BLUONICS Complete Well Water Solution with 110W UV, 3 Big Blue 4.5"X20" Filters, a pre-filter and extra filter set and 2 extra uv bulbs