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Such tests will be made as are necessary to prove the adequacy of a lamp or any of its parts in fulfilling the purposes for which it was designed. These tests include the following:
(a) Safety tests, including tests of safety devices, electrical contacts, and explosion-proof features.
(b) Photometric tests.
(c) Tests to demonstrate adequacy of mechanical strength.
(d) Tests of nonspilling features (storage-battery lamps of class 1).
(e) Temperature tests.