snalberski said..
I agree with the numerous posters who recommend a lightwind board. I have a 14m kite and a North Nugget and it works a treat in the low teens. The board is a huge part or the equation. A few guys at my local have Zephyrs but they never seem to have them out unless its super light (below 13knts). I can only assume they are too powerful for that wind range. I think with a 12m and a Nugget you should have no troubles in as low as 13knts
An average weight rider like me (76kg) can easily handle a Zephyr to 17/18 knots, and probably a bit more if the rider is experienced. However if the wind is blowing consistently above 15/16 knots, I'd definitely choose a smaller kite, unless the wind was holey or predicted to drop.
The biggest factor to light wind kiting is the board, I've got a Cabrinha Stylus 1.65 x 48 and it can keep me mowing from 8-10 knots on the Zephyr, and similar with a 12M Chrono foil, but the Zephyr is the easier and better kite for 90%+ of riders.
Recently, this week I've been out kiting with several others on various kites and board combos, none of the people on 12M inflatos and boards in the 1.35-1.45 range can stay upwind below 15 knots. The only riders actually staying upwind in 10-15 were people with 14M or larger inflatos/foils and larger boards.
The Cabrinha Stylus rides really well from sub 10 knots to well over 15 knots, while some very large "door" type boards are quite horrible to ride above 14/15knots, try to demo first, or talk to owners.
I can ride my 5'10' Cab skillet down to 10-12 knots with the zephyr or 12M Chrono, prefer minimum of 12 knots, but lulls to 10 are ok provided there is some periods of 12 to allow me to hold ground. Winds of 10 knots and lulls below, definitely require a 17-19M Lei or foil AND a large board. Directional semi-race boards also work very well for sub 10 knots, things like the Airush Sector 66 ( I have one) and Cab Stylus and race boards all go well under 10 knots, but you don't want to be crashing kites under 10 knots!!