The UV Ballasts ramps up the input voltage and has an output voltage high enough to spark the lamp. A ballast is needed due to the construction of the lamps, they have negative resistance between the two electrodes. Additionally, a large voltage difference between the electrodes is needed to spark the lamp. Hence UV Ballasts differ

An ultraviolet light sterilizer is a water filtration process for your home. The system uses UV light to kill bacteria and microorganisms in your drinking water. Because there are no chemicals involved in the process, it is a safe and effective option for filtering your home’s drinking water.

As water flows through the ultraviolet light sterilizer, it is exposed to UV light from special lamps. The frequency of the UV rays that are emitted kills the bacteria by destroying the DNA of the microorganisms. This means that the microorganisms can no longer duplicate. This process is effective against viruses, e coli, bacteria, giardia, and other harmful microorganisms, and it is also good for killing harmful microorganisms that are resistant to chlorine.