These two http://cgi.ebay.ca/400-Watt-METAL-H...8993047QQihZ016QQcategoryZ42225QQcmdZViewItem and http://www.marinedepot.com/md_viewItem.asp?idproduct=MB8617. I don't mean the specific bulb and brand, I mean will the the two types of bulbs work with the same ballast and socket.
