I think they introduced them from early 90's, also depended on the intended market too. As for the issue of switches etc, i'm assuming you mean burning them out, the trick is not to overload them. Anything std, i.e. 60-70 watt high beam should be fine but above that you should run relay(s). The wiring in mine shows slight browning and it's always had std headlights, so I think they would really benefit from a relay. Actually even a std headlight works better through a relay, more power. Don't over tax your alternator by adding too much load.
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