Blacklight isn't actually ultraviolet. You can't see UV, but you can see blacklight. At least everyone I know can. It's right on the edge of being UV, hence why it is a deep purple rather than invisible. But it's still visible. They just always call it UV to make it sound cooler than it is. Not that it isn't cool, but I can certainly see it. That's why lots of places light with it, even when not triggering the effect that people want, it's still enough to see by.
The violet glow of a black light is not the UV light itself, but visible light that escapes being filtered out by the filter material in the glass envelope.
It depends on what you refer to as "black light".
If you define a blacklight to be the device itself that emits UV light, then yes, you are seeing the visible light that escapes as mentioned above.
And FFS, to finally readdress my original point, the light isn't black.
Do you know, or think - please indicate - if that will work when connected to a ES‑48‑500W with a 10GTeck SFP SX GBIC?
Are you asking if the SFPs will work in the switch or if the SFPs will talk to each other? if you asking if they will talk to each other yes, It's still ethernet. As long as you are using the same type of fiber SFPs (or ones that will take SMF and MMF) and the correct speed and micron then they will work, that is unless you try something stupid like using a SMF run a few feet apart you will burn out the SFP.
But it is standards based and it is still just ethernet, the one side doesn't care what brand is on the other. It's the same as plunging a CAT5 Ethernet cable into dissimilar brands of switches.
That's nice, but you'll have to convince me that this is news. Fiber network taps have been around for almost as long as fiber. With fiber you can monitor the drop in signal. That's always been the real differentiator, the fact that you can tell you've been tapped.