Quote Originally Posted by AgX View Post
TL tubes without ballast? Such does not exist.

(The only fluorescant lamps that do not need a ballast (as it is built into the lamps) are the compact types. But these are not offered as UV version to my knowledge.)

I don't know, the tubes themselves are from Philips marked TL 20W/5. I don't know, perhaps the armature has the ballast inside it but it has been so long ago I build it that I don't remember it if it had. I know that it was the cheapest way to get UV light were I live as the whole setup was about 40 euro to build (with 2 tubes).