After much research, decided it was time to finish converting the Vibe to all LED lighting. The only holdout were the headlights. Recent changes in LED headlights finally made the transition possible. Went with 2500 Lumen HB2 H4 4-Cree-XML2 with a braided copper heat exchanger to work around any obstructions in the front grill/engine area. Through the project the copper braided design seemed to offer the most flexibility, the other LED assemblies, with massive heat sinks or fans looked to have issues with installation or longevity.
Link to video showing basic tips on installation with highlights of LED light performance compared to halogen.
https://www.youtube.com/watch?v=_PEejCsIV1I
Some other considerations during the upgrade; light with neutral color, didn't want LED's off color or too blue, high and low beam close to or exceed halogen brightness, and track record on installation. Went with this design:
In May 2015 paid about $54 for the set.
Encountered some issues during the installation. Most problems stemmed from the short barrel/shaft on the LED assembly. The Vibe's headlight housing rubber boot is about 1cm deep and fits perfectly over the barrel of the halogen bulb. The assembly I used only had about 2mm of space on the barrel, which required folding and flexing the rubber boot to make it fit. Fortunately the rubber boot is very flexible (at least in the summer). Bending the boot to shape around the LED fixture, makes re-installing the metal retaining clip all but impossible without removing the headlight assembly.
On a side note removing the headlight housings is reasonably easy, in my case I found rusted hardware and paint damage that needed repair, so it provided a good opportunity for some preventative maintenance. If you have hazy headlight assemblies, while removed, you can make the lighting upgrade a weekend project by re-clearcoating the headlight housings.
Once I get more miles with the current configuration will post details. So far with about 10 miles, I like the low beam better than the stock halogen. The LED assembly fills the road surface and the color of light provides more contrast, road signs and objects seem to "pop" out easier. The only draw back on the low beam, their seems to be a shallow blank spot directly in front of the vehicle, a result form how the LED's light bounces off the reflector. I did like the halogen high beam pattern better, the LED seems to be focused more narrowly and does not have the halogen's side to side fill.
Other than the change in how light fills the road, my only concern is winter. Will my headlights will be more prone to ice up without heat from the halogen bulb?