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how long is burn time for standard exposure unit...thanks for the response too! | |  | |  | |
There is no standard burn time. Too many variables come into play.
Type of exposure unit. type of bulbs, how old the bulbs are, type of emulsion, age of emulsion, type of film, vellum being used to burn art, screen mesh, etc.
What exactly are the issues you are having?
State What type of unit are you using, what type of bulbs, what type of emulsion and screen mesh