Hello Jenny,
We are using the Newport FSQ-GG400 filter which blocks below 400nm and the Newport 20HMS-0 Hot Mirror. Links below.
https://www.newport.com/p/FSQ-GG400
https://www.newport.com/p/20HMS-0
Sorry for the slow response.
Mark
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Mark Benson
Associate Conservator
Getty Research Institute
Los Angeles
United States
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