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Are you talking about headlights? I belive the HID lights (at least aftermarket) are complicated by needing more power and/or more voltage than is usually avai

• jdietrich 10y ago
  >Are you talking about headlights? No, scuba diving. Tech divers who operate at extreme depths or in overhead environments need powerful flashlights. They need to be reliable and redundant, because you really don't want to be stuck in a cave system or a shipwreck with no source of light. HID was the gold standard of dive lighting for many years. The thermal issues that accompany HID lighting practically disappear underwater, because you're floating about in the world's biggest watercooling system. As gaius said, LEDs suddenly overtook HID lighting a few years ago. The brightness, light quality and beam shape of LED lights matched HID, at which point the changeover was inevitable. LEDs don't explode if you drop them on the dive boat, they turn on instantly, they have consistent color temperature and they're efficient and easily dimmable. HID and HMI still have a role in underwater photography, but it's a shrinking niche.