I'm interested in a complete A19 head but am confused because they are listed with the various drivers. What is the difference between the GD666, GD750, NG750 and DB917 ? Please help.
For those of us "technologically challenged", though, the first three drivers you mention will work with a single 123 battery holder, while the DB917 is basically designed for a 2X123 battery holder.
With respect to the numbers assciated with each of the drivers, the usual "rule of thumb" is the higher the number, the brighter the beam of light...but the shorter the run time.