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What is UV dose?

April 26, 2017dose UV

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What is UV dose?

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UV dose is the energy that is coming off the UV lamp over a specific time period. Therefore, UV dose (or fluence) is a product of UV intensity and time. Dose is usually measured in milli joules per square centimeter. Each Sterilight system is rated to disinfect your water at specific flowrate, under specific water quality conditions to give a UV dose of 30 mJ/cm2 at the end of the lamp life (which is one year). If you were to run say 10 USGPM through a 5 USGPM Sterilight system (ie. S5Q-PA) then you would only be receiving HALF the dose that the system is rated at because you doubled the flow. It works the other way as well. If you were to have a 12 USGPM Sterilight system installed (ie. S12Q-PA) but you were only running 6 USGPM through it then you would be receiving double the UV dose as you are increasing the water’s exposure time to the UV light. The UV industry standard for dose is 30 mJ/cm2 at the end of lamp life (EOL) however different validation protocols will specify differen