They are quite (both quality and cost wise), but this re-work of them makes them much more reliable and useful. Look for the ” ” powered by 3xAAA batteries. They have a simple aluminum tube for a body…
I bought a $5 and put a circular piece of red construction paper behind the lens. It works perfectly and doesn’t give off much at all, yet it’s perfect for reading star charts and other things up close in the dark.
− 385~395nm – Purple UV – Black (3*AAA). Model: N Quantity: 1ColorBlackMaterialAluminum Form Color: Black Material: Aluminum Color BIN: Purple Number of Emitters: 1 , 10 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 Wave Length