Hi, the white wire will give u 6VAC (or there abouts) when its loaded. If u just measure irs output without it working over a load u'll get pretty inaccurate readings as the only load it will see is the internal resistance of the volt meter. It outputs about 0.3A before it starts draging down the CDI's supply as the two coils are series wound (even if they werent it would drag it down), so it will supply 6V at 1.8 watts (actually 1.79 watts). Bicycle lamps for use with a typical bottle generator generaly use either a 0.4 watt or 0.7 watt bulb & for a motorized bicycle are practically useless, as is trying to run an incandescent light directly off the white wire & hoping to be able to see with it. It can however be used to charge a battery quite well. I rectify its output with Schotky diodes (they have lower forward voltage drop across them than standard diodes), then charge a 6V/4.5Ah SLA battery directly off it. No regulator is needed as it wont cook a battery due to the low current output. I then power a 6V, 26 Watt Halogen incandescent off the battery. This gives good enough light for riding at reasonable speed on unlit roads. I havent tested duration past 20 minutes or half hour, tho the battery is still good at that duration. U could also use the white wire to charge the 8.4V battery for the LED light from SBP quite easily I imagine by using a voltage doubling type rectifier into an adjustable voltage regulator to give the nescessary voltage, or a rectifier/regulator/voltage pump that someone gave instructions & daigrams for building on this forum a while back. Hope this helps. Cheers