These LED bulbs are a simple, quick, direct and brighter replacement for standard BA9S / GLB989 / GLB233 bulbs. A very common application is sidelights although they are also fitted elsewhere - suits all bulb holders taking the standard bulb as per the numbers above. As well as being brighter and lasting longer they have the additional benefit of reducing your power consumption to a much lower level which may benefit older/tired wiring.
12 volt (not 6 or 24 volt), negative earth (nor positive earth)