Imagine making a louvered insert grille for a 400w MH high bay.

Apparently the bulb is UV transmitting glass and produces large amounts of UVA and moderate amounts of UVB . GE recommended to always wear sunglasses and to keep your eyes closed during operation . GE also said that the UV intensity is "several times that of the mid summer's sun "

including a round louver fixture for circline lamps.

Didn't you post a picture of something like that a while back? I was actually going to look into making something like that to fit over a circline adapter but I wasn't able to find any at restores/thrift shops so I kind of forgot about it.

Oh wow, if you have the room you could probably buy the whole lot as the seller probably wants it sold as a lot and then sell what you don't want on eBay.

What kind of UV do they produce? Cant be UVC as this is a glass bulb

Those are SBMV and since they emit LOTS of UV they aren't recommended for use without eye protection .

I have one of these. I accidently used it to light up my yard one winters night when I was outside. Probably about as bad for the eyes as a sunny winters day with all that sun reflecting off the snow.

I think they're GE .

This is just a pathetic sunlamp.

I do like the post top lanterns.