Thread:VendettaVisionGuy/@comment-30979292-20170429133021/@comment-26547082-20170430121007

On second thought, I suppose a block that doesn't cover a light source can be translucent, if it doesn't diminish the light level. I don't know how to test that though. Maybe HelenAngel will be able to find out whether those blocks were coded as translucent.

So yes, buttons and redstone dust are translucent. Sea lanterns and glowstone give off their own light, so no. Basically if the block can be placed on a light source without diminishing the light level in any way, it's translucent. If only there were a way to test the light level...