If you have a UV light and look at the bulb or LED, you don't see any light coming from it at all? The bulb just looks to you like it isn't on? UV bulbs look b

If you have a UV light and look at the bulb or LED, you don't see any light coming from it at all? The bulb just looks to you like it isn't on? UV bulbs look bright purple to me. They are so intense, I can barely even look at them directly. I always thought they were called black lights because they do not appear to light up a room (excepting materials that fluoresce under UV light); the UV light itself is very bright, but everything else stays almost as black as if there were no light at all. I don't think I can see UV light, though. I don't see UV patterns on flowers that have them, for example. I think I am just seeing some violet light that UV bulbs also release, and maybe it feels so bright because the invisible UV stings my eyes.