CureUV Brand UVC Bulb for Neptune 5030 HS-UV-SS-M-24 you want to get as

you want to get as much UV-C intensity as close to the coil as possible

Length - 20 9/16”

5mm x 2 mm

If you would like a generic equivalent replacement in order to save money

CureUV Brand UVC Bulb for Neptune 5030 HS-UV-SS-M-24 you want to get as4 Pin on a Single End 39 Watt Germicidal UVC Bulb Our CureUV brand Replacement UVC Light Bulb for Neptune 5030 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 light technology works to kill