well no idea about peoples using them,
Onces installed them in my Indus Crystal lights (without projectors), 55watt, nothappy wasted my money
another time installed in my Accord 89 ( 2 pairs without projectors) no doubt HID was pretty bright bu it burnt chrome and had zero percent view on h4's yellow bulb.
that was just my experience,,,,, no offense to others who are using.