Have you guys checked out enviro-lites?
Check their specs:
This isn't the only place to get them, it's just the first thing I pulled up on google with all their measurments. They're a little pricey [img]http://www.**********.com/iB_html/non-cgi/emoticons/wow.gif[/img]
But they seem like they might be worth it if you have money to burn....