CureUV Brand UVC Bulb for Water Treatment & Accessories 05-0319-R Power_2400 Watts Experts also state that it

Experts also state that it is necessary to replace the UV light bulb annually though it may continue to emit light for better efficiency

Tube Diameter 26 mm (heavy duty)

Optic Power: 3800mW/cm²

The UV reflector is a guaranteed replacement part that exceeds OEM quality of curing performance

The UVC bulb is compatible for use with the following models:

CureUV Brand UVC Bulb for Water Treatment & Accessories 05-0319-R Power_2400 Watts Experts also state that it4 Pin on a Single End 39 Watt Germicidal UVC Bulb Our CureUV brand Replacement UVC Light Bulb for Water Treatment & Accessories 05 0319 R is a 39 watt germicidal water treatment bulb. With 4 pins on a single end, this germicidal UVC light bulb features a peak UV output of 253. 7nm. This wavelength region comes under maximum germicidal effectiveness and is highly fatal to microorganisms such as bacteria, viruses, protozoa, and other pathogens. UVC