I have them on my 2000 GMC Yukon XL SLT (with Denali headlights) and love them. The white light from these lamps is almost as bright as my 35 watt HID low projector beams. As another reviewer said, the parking lights turn off when you turn on your turn signal and have a slight delay before turning on again. I found it more comfortable than lights alternating between white and amber. In the photos I've attached, the brightest (first photo) are the fog lights (standard halogen bulbs), switches, and 35-watt HID headlights. In the second (slightly darker) just the HID and switch, in the third photo just the switches themselves. In the last photo the truck is in the forehead. Remember they were filmed on a foggy wet night so the sidewalk is wet. I've only had them a month, but so far they're working great.
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