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raden

In message ,
writes

How can one safely tell if a UV lamp is working? This is a UV tube in
a pond filter system which lives in a lightproof (well, UV proof I
suppose) tube with the water going to the filter flowing past it.

It has standard fluorescent gear, a choke and a starter.

White material especially after having been washed should fluoresce when
exposed to the light

that's all I can say

--
geoff