It needs a ballast resistor. I run my 1.5v glow driver clip driect through a power panel connected to a 12v, 7A gel battery. Some power distribution panels have glow-charge "stations" built right in (looks like a glow-plug screwed into the face plate). The circuitry is behind the plate. Or, you can add one of these:
May also have a step-down transformer, but I don't think they are that sophisticated.
How does your household 117v wall plug know whether you are plugging in a 75W bulb,, a 1000W microwave or a 1500W hair-drier? Same "magic."