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EFR (64634 HLX) bulb applications: medical and dental equipment, projectors, microscopes, fiber optic illuminator. Philips Cross 6423FO
EJL lamp applications: photo enlargers, projectors, medical equipment. Cross Reference: Ushio (1000300), GE (29150), Philips (31508-5).
Possible substitute: EJA (less light, less life, less heat).