Well from the pics I've seen and the reading I've been doing, they will def be brighter! I've got a couple write ups and videos saved that I'll use as a step by step when I get around to doing it. Here's a couple write ups:
This one has an older set of Hellas, so the casing is a bit different than the set I have.
http://www.yotatech.com/f131/hids-he...ctures-202736/
This one has the newer version.
http://www.tacomaworld.com/forum/lig...ow-w-pics.html\
The only major difference is the clip that holds the actual light bulb in.