Light for Giant Quick e+ 2018 I purchased a 2018 Giant Quick e+ for commuting.  Giant uses a modified yamaha PW-X system they have branded "syncdrive pro".  The bike is great but the headlight it comes with stinks.  I would like to drive a light with more lumens off the battery. The yamaha system uses a 36V battery that it drops down to 6V for the headlight (and presumably the tail-light).

For the 6V systems there are some options including lights from lupine SL S Yamaha E-Bike Light (500 lumen) and supernova mini2 (235 lumen).  I am getting one of of lupine lights to see if 500 Lumen is enough.

The question: I am not sure why Yamaha decided to use 6V internally, except for perhaps cost.  You can buy a 36V DC to 12V DC converter that is waterproof. IF installed the converter (and find a place for it) it seems reasonable that I could rewire the bike to use a 12V light. This would let me have a light that drives up to 1100 lumens.  Am I completely nuts or is this reasonable?
The answer to your question is that 12V is not the standard for bicycle lights. 6V is. There are a lot of very good 6V cycle lights designed for dynamo power (I don't know enough about the Yamaha/Giant wiring to know how they connect to lights). Or you can get a separate battery powered light (again, lots of very good options available).