Looking to setup a ecommerce automotive lights business
would you use www.xenonreplacement.com or www.conversionheadlight.com
keep in mind its related to bulb sales

Register both. Then you can URL forward one to the other. :)

Register both but advertise XenonReplacement IMO it sounds better.

Register both but advertise XenonReplacement IMO it sounds better.
I agree Xenonreplacement does sound better. You may want to buy the other to promote XenonReplacement, or foward as the others have suggested.
All the best,

Xenonreplacement is definitely awesome :) That kind of name would attract me.
Send me a PM when the site is up. I'd like to take a look.
-mike

Xenonreplacement is good. :)

In my opinion, I'd go with www.conversionheadlight.com
Now I do not know all the different types of headlights; however, I believe xenon is a brand or a type of headlight? Where as, conversion head light can pretty much advertise different types of brands and or type. Therefore, you would have more to work with instead of just xenon. On the other hand, register both if you can not make up your mind.

Analize the most popular key phrases for your website and try to include them in domain name!

i guess you have registered both. xenonreplacement.com sounds better and is more popular in google search.
on a different note, i was wondering if it is good to ask for domain names on public forum. there is always a fear of loosing the domain name.

XenonReplacement is better sounds :) Go with it !

XenonReplacement.com sounds better but as said above register both and point one to the other. ConversionHeadlight.com sounds more for a service so that could be better.
I just like the name XenonReplacement.com more than the other one :)

The best you can do is to have your business name (brand) alongside with the business field of activity in your domain name. Another good option is to have the brand only.