Hard to say. The light in question is a "Cyclops" brand light. The body is anodized aluminum and it takes 2 x CR123A batteries. I has springs on both ends of the batteries and an orange peel reflector. I don't see any markings on the bulb.

Maybe if I took a photo it would help? Or are there just a few somewhat standard sized of bulbs/emitters?
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman