Mark - depends what you want. All my own hand spec books are somewhat out of date, but were from the largest coating facility in the world at the time, not far from here. The nice thing about them was that they had so many leftovers, that a simple small seemingly custom filter order might be shipped free as a courtesy sample. But now you'd need to check other sources. The whole point is to trim of some UV too, but not enough to affect visible colors in the print. Most of the heat needs to be extracted via a pull fan duct anyway. You can't rely on passive methods if a modern halogen bulb is involved.
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