If you are in search of a replacement UV lamp for your Pura Addon-1 or Pura UV-1 Series system, the PURA 36002016 Replacement UV Lamp #10 is the optimal solution as it serves as a direct replacement bulb for these particular models. It is imperative to replace these lamps annually to maintain optimal water quality. This vital component functions by neutralizing micro-organisms through the use of UV rays, rendering them harmless. The lamp utilizes 10 watts of power.