you can't put just any LED bulb in the High beam spot - it's going to have to be a high power LED.
IE something that's going to cost north of 100 dollars.
why - it has to push high lumens, or rather LUX to get out over the factory low beams. so not every LED on the market is made for that - and some are ment to just be flashers - ie your flash to pass bulbs, which on the explorer and many other cars is your high beam bulbs.
keep in mind the halogens you are replacing are a uncoated, 55W each, so they throw some real light. it's not the whiteiest and might not look that bright to your eye but to a light meter at 100 yards it's a spot light.
also notice that the Factory low beams - have their own heat sinks - that dark grey ridged housing is coated AL. they draw some power, 30W each if I guess correctly as that's been about the common application draw. they also throw some major LUX out the front of the car.
then there's the application - IE the housing - it's designed around a non-focused light souce for the high beam - so the housing and reflector is the focusing ###tion - if you put an LED in the hole - that's already desingned as a focused beam you will loose some usefulness. you need a wide area bulb replacement -because that's precisely what you are replacing.
Hope this makes some sense.