Power generated is a function of the value of lift coefficient, wind speed and surface area. L/D ratio will tell you what angle your kite will fly at. High lift coeff kites (Blade, other thickies) produce lots of power in low wind but tail off as wind speed increases (proportionately that it). Weight of kite (except for some of the overweight kitesurf stuff) always works out at about 160-220g sq metre and is minor compared to aerodynamic lift generated by the wing. Don't know about the Bego 600 being a light wind kite- needs at least 8mph to fly- USE a proper wind speed meter if you must quote minimum flying speeds! I would pick an Inflight Vector 5 (out of production) as being the best ever low wind foil although a re-adjusted Bullet 4.5 isn't bad