Slowly but surely, although there are still a lot more irresponsible nincompoops driving around with HID bulbs in stock headlights, with no cutoff whatsover, and blinding everybody else. Not only that, as their light output is as poor as their IQs they have to turn on their high beams (which are HID as well) and make everything worse. And many of these are SUVs with the higher headlight locations, adding to the risk of accidents.
HIDs are a performance enhancement, not bling. And like all performance enhancements, there are certain parameters that need to be fulfilled to maximize the benefits of the modification. So be prepared to modify extensively and accordingly if you switch to HIDs. Let's all be responsible motorists.
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