I don't think they put out more light. However, they do reduce glare and use them in fog. There is a lot of talk on this subject. You can also check out http://www.philps.com
for their auto lighting section. There was also a article on this and lights in general in Motor Trend or some magazine a few months back. I know for me that yellow reduces the glare of fog but, does nothing for me in the rain though neither, does the white, blue, or whatever color do either. I think if you have the time and money the E-code lights are worth it.