First off, these are bright things! Works fine with some of the cheapest h4 led bulbs in the h4 case. But they have better cutoffs. Now for the pitfalls: 1. 105 watts. Not even close. I've measured that the power draw is about 2 amps per bulb, giving 4 * 14V = 56W. Maybe they say it's as bright as a 105 watt incandescent bulb, but I think it's some kind of marketing prank. If you have an older Toyota (like my '91 pickup), you will need the headlight relay harness. This converts standard Toyota minus switch sockets to standard plus switch sockets. Moving the pins will give you either high beam or low beam, but not both at the same time. Finally, unless you add a load (like a 6 ohm resistor or light strip) to the high beam circuit, the high beam indicator will be very dim. All of this, as they say, is simply amazing if you aim it right.
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