For light wind get a light wind boars like the CrazyFly cruzer or cruzer pro. I own www.AtlanticKiteboarding.com
(and have a phatty on the way), and get calls about using surf boards as LW boards. I dont recomend it necessairly. LW is also a relative term; for me LW is 9-14mph @190 i use the CrazyFly skim and a 17m Ocean Rodeo Flite. I am hopeful on my new 15.5 LF solo for LW as the 12 is really increadible. The issue with using surf boards is that they hace rocker. LW riding is about getting on a plane. Sooo thats why i use a skim. Its about as flat as it gets, and with no fins its even better. I think its a ton of fun in 9-14. But once its a steady 15mph then i will use the LF Solo 12m and a Mitu Pro surf and now the Phatty. The real question i would ask is "how light are you talking?"