Lights Without a Ground

[Howie]

Today we put in some new outdoor lights(motion-sensing). We didn't realize that the house was wired with a ground also. I was informed that some old houses don't have a ground, but that it is required by code(if we ever get an inspection). What can happen when a light is not grounded? It's plastic and the two grounds from each light are wired to where the house ground is supposed to attach. It is not attached. What am I risking by not having the ground? How severe is this risk?

Thanks

[ibew1]

do lights have ground or not. does your house panel have ground