One other thing to consider with that arrangement is this. When the windmill is turning, it will produce AC voltage from the moment it starts turning. However, it won't start to put power into the batteries until it reaches the "cut-in" voltage, or the voltage at or slightly above the voltage of the batteries.
Now, if you put a large resistive load on the AC side of the rectifiers, that load will begin to load the windmill as soon as it starts to turn, not when it reaches cut-in. For this reason, it will make it harder for the windmill to start, and will likely raise the cut-in RPM of the windmill. A small load that just loads a small percantage of the load rating of the windmill won't affect it much. But if it is a light bulb, it will vary wildly in brilliance until the windmill reaches cut-in. Then it will stabilize. So in low winds, you'll have a hard time using the light output for anything useful. Heaters won't care but if you put a heater on it, that isn't a small percentage load. . . that is a major load.
Light bulbs are inefficient, and have been nclassified as heaters with a byproduct of light. Use the power from the batteries and run CFLs for more efficiency.
Doug