A wide angle beam like a fog light would probably be the best pattern for cutting through dust. From what I've heard, dust and fog require very similar beams and light temperature to cut through.
Since Im on the subject of lighting...Let me get some feedback. I currently have 2 8" HID driving lights and 2 LED flood ditch light pods. Would a light bar just be overkill at this point? I realize the cool factor, but functionally speaking does it make a difference? So, if you have an addiction to lights (like me) please talk me off or over the ledge, which ever is your preference.
The intention is to be prepared for any and all of our Overlanding trips. Its not uncommon to end up on a trail much longer than expected while headed for a proposed campsite, while in the dark. My thoughts are, though I will admit to being a light junky, the HIDs are intended for long stretches of good graded road, while the light bar and ditch lights would be more so for confined spaces like heavy wooded areas and changing topography.
Thoughts?
Some advice from a fellow LED light junky:
First, for dust/fog lights I prefer the driving pattern and amber colored LED's. I used to have the flood in white, but it didn't provide enough distance. I felt it was too spread out in every direction, and the while light was too reflective in the fog.
As for LED light bars, I'm not a fan of one large long light bar. I prefer to have several short bars or round lights or light pods. If you get several smaller lights, you can get them with different optics, beam patterns, colors, and point them in different directions/heights also. Put each pair of lights on a different switch. Then you have options. I have several different types of LED lights on the front of my truck, all on separate switches. I have numerous options and combinations I can use for any situation.