I am sure that the 6V / 12V argument could go on and on, as both have their different merrits / pitfalls.

Main reason for converting the DT was that the CDI source coil was badly corroded and would be just a matter of time before it failed, also the OE CDI unit on the DTs have a reputation for unreliability and not being very co operative when the engine is hot.

I could have just bought the ignition upgrade, but it made sense to me to buy the combined ignition upgrade and 12v conversion - the coil that provides the power to lights and battery was also in poor shape.

The 6V system on the DT 400 also has a rep for blowing bulbs as it is poorly regulated, apparently Yamaha had many attempts at trying to sort it out, the 12v conversion I have is supposed to be better regulated.

One of the + sides of 12 volts is that I can also connect a USB adaptor to it - never seen one that works off 6 volts. It also means I can keep the battery topped up over the winter as I dont have a decent 6 volt battery charger, only 12 volts.

As part of the upgrade I also disconnected / re connected / cleaned every connector I could access, as well as adding the "star" earth point, so hopefully covered all bases.

The lights certainly look nice and bright !!