Let there be Light, about two stops worth please.
Iím not clear what camera you are putting this on and where you are
That may be important, not sure.
I am very happy with a Bosscreen from Bromwell BT on my 4x5 Linhof Technikardan
I am adding a Beattie to my 8x10 late Sinar P with metering back based on trying a friendís Linhof 8x10.
If you go to the Beattie website they will tell you where there are dealers in the USA. In Ohio I ordered mine from Mid West Photo Exchange. They said deliveries can be erratic, but mine came in three weeks. They called Friday to get credit card info and said they would send it to me then.
Hope that helps.