The clear glass plate for flat fronted lights is used with B1, B1X, D1 and D2. It’s available in different coatings: one standard frosted, one UV -300K, one UV -600K for an even, diffused light and one clear option for a harder and crispier light. They all give warmer or colder light characteristics.

Note that the Glass Plate for Flat Front is not compatible with the B2.