What is the brightest h4 headlight bulb?

Now everything wants the brightest h4 headlight bulb for their own car or vehicles ,while what is the brightest one and how to choose the bulbs ?

Most of people know that the power and lumen stand for the brightness for headlight bulbs and most of them only check the power and lumen when they buy it ,while cause of that many sellers know this and then some of them write the power and lumen much higher to attract the customers to buy it .  So even they do not write high ,it has some loss and it has a raw lumen and effective lumen. So when you are buying it ,you can ask the seller the effective power and lumen and also the test report

After checking it and you need to test it by yourself ,of course it is check the lighting performance when you install.  

This is still not enough ,cause some lights are very bright at the beginning ,but after you use for some days ,it is not bright any more.This is the problem of luminous attenuation and heat dissipation ,while how to check the luminous attenuation ? Usually you can check it by the led chip ,try your best to buy the genuine brand led ,such as CREE,Philips which is higher luminous attenuation. The best heat dissipation is still the fan up to now

So the best brightest h4 headlight bulb is CREE or Philips led headlight with fan

1.Jeep Headlight Wiring Harness

Most stock components on a vehicle are designed to a specific level of performance and nothing more. The factory headlights on a Jeep TJ are no exception. They do exactly what they were intended to do: They light up and allow you to see a little way down the road.

We realized pretty quickly that the stock, yellowish, headlights simply were not going to cut it. But, we also wanted more with this Jeep than the usual Sylvania Silverstars upgrade could give us. Once we started shopping for aftermarket headlights, it readily became apparent that any quality aftermarket light would be a substantial improvement, but to fully realize their potential the worn out stock wiring would need to be addressed.

Taking a voltmeter to our project vehicle, and a couple others, we found the power actually making it to the headlights (measured with the engine running and the headlights on) was about 12 volts on our TJ and as low as 9 volts on an older XJ. None of them actually showed us the full 14 volts we measured at the battery. So before we get into swapping in new bulbs, lets go through building the foundation for some really kick-butt headlights.