There is no direct relationship between candlepower and watts. One is a measure of light(lumens in modern metric), and the other is a measure of work or power. I know, not much help.
There is a general rule of thumb that has been out of use for a long, long time. For a tungsten filament bulb in vacuum, one watt of power would produce about 4.8 candlepower at one foot(where we got the term 'foot candle'). If your beams are 21 candlepower, that would be 21/4.8 or about 4.2 amps per lamp.
Your generator should be of the 'lamp load' type and I think it was a 943J and the cutout should be set for 7.2 volts at 2100 RPM(highway speed in gear). The wire from the gen will go to the lamp switch so that when the lights are on, the lighting will present the load directly to the generator, to be more efficient.
If you want to improve things, you can take your incandescent lamps out, and replace with modern lighting, specifically LED. You would need to have a cross reference for each lamp unless you want to just wing it. Some 12 volt LED bulbs will illuminate at 6 volts, you just need to test them. There are many cross refs for 12V lamps, but few for 6V. I think your generator is rated for full current at highway speed of 16 amps. Derated for stop and go, and around town it would be 12 amps.
If you have a generator with exposed armature, that is a 'vented' unit and may be 22, 25, or even 35 amps. If you want to stay with stock, don't replace with the modern style headlights rated in watts. Your gen will not put out enough current, and the wires also are unlikely to support it. Remember, when you halve the voltage(12 down to 6), you need to just about double the current rating of the wires.
I had a 1937 Cord Beverly with a 35 amp 6 volt system. I was always having issues getting it to start, because I didn't take long drives, and sometimes I would use the tube radio, and heater with fan motor. The batt didn't hold up well. It's best once you start it to drive for a while, or keep the batt on a trickle charger at 6V
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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