Thanks guys,

@Bob: It doesn't have shutters, but I guess I could think about making some, although not really a practical option at this point.

@David: would something like this do? I can't find the REE10 etc this side of the pond. It says "constant voltage," so I a guessing not, but can't find anything so far that is variable voltage other than a $300 variable transformer.

https://www.amazon.com/uniquegoods-5...dp/B00QLH8530/