That glass blocks visible light, but looks pretty transparent to both 850nm and 940nm. So either kind of IR LED should pass through without an issue. Keep in mind that the light leaving the IR LED forms a cone. So you want to make sure that the diameter of that glass is at least the same width/height of the square enclosure.JCMpercussion wrote: ↑Wed Jan 24, 2024 5:41 pmhttps://www.amazon.com/Gzikai-9-6mm%C3% ... 0981BX423/
That glass says it's 9.6mm diameter which is pretty small (less than 1/2"). So unless you were planning to use a lot of them, it won't cover much.
You don't need a cover, it's just aesthetic. But I still have some precut ones available if you want. See this post