Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
I find that white cathodes are the brightest, depends from manufacturer to manufacturer though. I have one white one and it would easily light up a full tower case.
Most UV light isn't even visable to the human eye. The UV cathodes are actually near UV, which allows them to be seen. However, because they're barely visable, they won't be as bright as a white, yellow, or red light. It's not even close.
All of the UV CCFL's I've seen are all about the same brightness. Personally, I'd go with a Sunbeam for their quality, reliability, and low cost.