Will I run into any reflection issues if I place a piece of glass
between the water surface and the shop light (or whatever I get)
to ensure that no water gets into the light fixture.. Or am I
being too cautious..?

No, what you'll get is a white deposit on the underside of the glass from
mineral deposits that you'll want to clean weekly with very warm
vinegar and a scouring pad. No reflection issues though.


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