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The ANSI containment test was developed by the ANSI Standards Committee C78 to determine if a lamp can be rated for open luminaire operation. In the ANSI C78.387 test, arc tubes are forcibly ruptured to test the integrity of the lamp, i.e. to determine if the design can be containment-rated. In order to receive the “O” rating, the outer bulb cannot be cracked or broken.
