So I geek out over lighting a little. Please bear with me.
What reason is there for a light bar on these cars? Is it because there is insufficient light output from the factory lights? Is it to act as a foglight setup? Driving light?
I appreciate how they can look cool and all, and if that's your thing, that's fine.
I just don't care for people thinking more light is better light, because often it isn't.
Clear night, in town, low beams when properly aimed and with good bulbs designed for the housings should be more than sufficient (IE Halogen Incandescent bulbs in a reflector housing, HID or LED bulbs in a proper projector designed for the bulb). They should throw a clear, focused beam with no scatter and have a clear, clean cut off to not blind oncoming traffic.
On that nice, clear night, adding fog lights into the mix will reduce your visible range due to the much brighter, closly focused fog lights putting a bright spot near the closest part of your outside view. Similar to having your interior lights turned up too brightly will reduce your overall visibility because they are up close and a distraction.
On a foggy night, the fog lights and the parking lights will shine out close, but not reflect back at you as much. Many states require your headlights to be on as well, but they too can in heavy fog reduce visibility due to heavy reflection. Adding your high beams in this will immediately flood you with light and can blind you.
Same with rain, snow, etc.
Installing a "drop in" HID or LED bulb in a reflector style housing is a horrible issue. Light will scatter because the bulb does not have the same characteristics as the halogen bulb the housing was designed for.
So... With that out of the way, throwing a LED bar on can be good or bad, depending on the light pattern the LED puts out. If it's not set with a good cut off, it can act as a flood light and distract your eyes from focusing down the road. You may have a GREAT view of what's 10 feet in front of your car, but not that deer that's 50 feet out.
So... I'll ask again, what's the purpose of these LED light bars?