Iceman, bear in mind that the output voltage from the AC circuit varies considerably with engine speed. It being a Greenfield mower, it should be run with the lowest engine speed that can pull the load, so as to minimise clutch wear. That means that quite a lot of the time you'll be mowing at 2400 engine RPM, and the lights will only receive 8 Volts, which is not enough to operate filament-type globes usefully: their colour would be dull orange and there would be little light. It will probably be enough to operate LED lights usefully, because their colour is independent of voltage: they just give less intensity at lower voltage. However I suggest you don't plan on cranking out 100 Watts. Mowing at 3,600 RPM with a Greenfield would either involve implausibly high mowing speed, or rapid clutch wear.
