Hozelock Replacement 36W PLL UV Lamp Bulb - 1543This is the 36W replacement UV Lamp for the Hozelock Filter and UVC range. UVC Bulbs should be changed at regular intervals, ideally in the spring before the season starts. This is to guarantee the full strength capacity of the UVC light waves. The Hozelock PLL replacement UV lamps have 4 small pin connections at one end only. Key Features: Part Number: 1543 Genuine Hozelock Part. Change annually. PLL 4 pin design.