Get a pair of the HIR bulbs for the low beams. I've used them and the Silverstars, but the HIR bulbs put out much more light.
Do a search on this site for "HIR".
You can get them here
http://cgi.ebay.com/ebaymotors/TOSHI...spagenameZWDVW
or you can go to your local John Deere retailer and ask for part number AH211917.