On 27/05/2021 20:26, Jeff Layman wrote:
Have you considered an old camera lens glass for the cover? If you don't
have one, a camera shop selling secondhand film cameras might have some
old partially-broken lenses which could serve as a source, or even an
old UV filter. However, depending on what spectral range you are trying
to measure the light level of, you might want to have a look at this first:
https://petapixel.com/2020/06/04/why-uv-filters-are-basically-useless-on-modern-cameras/


bog standard UV filters might work - use em as lens protectors

random example gave me a clear glass protector

https://www.pricerunner.com/pl/282-3...Compare-Prices

--
New Socialism consists essentially in being seen to have your heart in
the right place whilst your head is in the clouds and your hand is in
someone else's pocket.