Light filter to UVM-30A to reduce sensitivity?

Question

Arduino

I am making a simple ultraviolet flux meter for my agama so I know when to change the lamp. I decided to use the UVM-30A module, but it is analog. And, as it seems to me, there is a chance that the sensor will exceed the limit of measurement.
What material can be used to reduce UV light output without completely cutting it off?

Answer 1

glass blocks ultraviolet light