I don't have any personal experience with it in the field but did find this information on the web today. I'll post 4 links to the different websites and then comment afterward. You may have to copy and paste these links into your web browser.http://florida.plantatlas.usf.edu/photo.aspx?ID=1199
This is the Florida Plant Atlas site and if you go to plant 8 (Lilium_catesbaei8.jpg) you'll see a picture that is light yellow / white.http://www.pacificbulbsociety.org/pbswiki/index.php/NorthAmericanLilium
Pacific Bulb Society - scroll down until you see a picture labeled: An ananthocyanic (anthocyanic?) form found in the Florida panhandle.http://www.sunnygardens.com/garden_plants/lilium/lilium_1708.php
Sunny Gardens website showing a cultivated yellow-flowered L. catesbaei: SunnyGardens - Lilium catesbaei 'Tiger Yellow' But, to tell the truth, it doesn't look like L. catesbaei to me.http://images.google.com/imgres?imgurl=http://www.lib.ncsu.edu/exhibits/wells/images/wells_exhibit/0021029.jpg&imgrefurl=http://www.lib.ncsu.edu/exhibits/wells/exhibit4b.html&usg=__05H-7LNYIP5zH99i9uqxWGyzqZo=&h=282&w=240&sz=55&hl=en&start=1&tbnid=TQG0qvSzlSuZMM:&tbnh=114&tbnw=97&prev=/images%3Fq%3DLilium%2Bcatesbaei%2Bvar.%2Blongii%26gbv%3D2%26hl%3Den
I believe this is North Carolina State Univ. website and here is the caption: Savannah Lily - Orange / Yellow - Lilium catesbaei var. longii
So, I guess there is something out there that can be almost white or light yellow to really light orange?