What sort of "HID's" is it you have?
If you just have fake "HID" bulbs (or even real HID bulbs) stuck in the halogen housings, that explains a lot of the poor lighting.
HIDs also don't have high beams, so you lose what you really NEED for higher speed road driving.
I would agree with [MENTION=186801]DjDom[/MENTION] that projectors are a good upgrade for the second-gen lamps. The aftermarket "one-piece" projector housings made for Explorers aren't so great, but if you want HID, get HID projectors and stick them in aftermarket housings with the clear lens. You should probably look at getting bi-xenon projectors if you can, since they give a low and high beam versus the low beam of the single projector lamps, though some also have a high beam using an H1 halogen bulb.
Eventually there will be LED headlamps that will put out more light and cost less, but for now HID is what you want for max light output on the road if you can spend the $$$, and halogen is what you want if you can't spend the $$$ but want plenty of light.
The stock headlamp housings aren't that great because of their size, but if they are clean and clear, and a quality 9007 bulb like the Sylvania XtraVision or Philips Hi-Visibility, or something even brighter like the GE Nighthawk/Nighthawk Platinum or Philips Xtreme Power are used, you can get a good bit of light on the road. Using a wiring harness with relays will deliver more juice to the bulbs so they'll be even brighter.
As for the LED light bar, it will only be a band-aid, since it will flood the road far ahead with light, but you'll still have poor lighting in front of the vehicle. That's a good way to have a collision since you won't be able to see something to react and avoid hitting it.
You can probably install it in the grille or even at bumper level and it will light in front of the vehicle more, at the cost of distance, but keep in mind it will be 100% illegal to use on the road, just like other off-road lights, due to the potential of blinding other drivers. If you are caught using it, (or actually blind a cop) the consequences could be severe, anything from a big fine to having your vehicle towed on the spot and impounded, jail time, and more.
You may want to check your local and state laws and those of the area the canyon is in, to see what the regulations for driving lights are. Some states, cities, counties, etc. do not allow driving lights on the road at all, others allow them with high beams but require they be wired such that they switch off when the high beams go off, and some only allow them on two-lane back roads but not on highways.
It may be worth pointing out that many exotic high-speed capable vehicles do fine with just the stock headlamps, using halogen bulbs. If the headlamp design is a good one, low beams for general driving and high beams for higher speed driving (when you're the only vehicle on the road) is all you need. Driving lamps, light bars, etc. are more for off roading like rock crawing, trail driving, rally racing, and stuff like that because you NEED more light all around and to see what's going on half a mile ahead. Even high-speed street racers with vehicles that can go way faster than the Explorer don't have driving lights or LED light bars, just really, really good headlights with nice high beams.