D.B.
I use the root touch up all the time - I've often gotten confused and bought a different shade of the Nice & Easy root touch up, going "up" or "down" the color spectrum. I don't see any difference, frankly - and no one can tell. A friend of mine told me about it and her hair looks great. I don't think the color on the box is a good indicator at all. My husband does my roots for me and he doesn't really know what he's doing, but it looks fine. My hair is darker than yours but it has highlights lower down (I stretch out the salon treatments by doing my own roots in between) so I use the medium golden brown. I think you'll be fine with the light golden brown.