My hair in the summer is a light brown with dark blonde highlights and has a little touch of red highlights. I do have a fair amount of gray. I always panic with color selection because I don't want it to go darker. I have purchased light golden brown g6 and dark blonde 7n. I am not sure which one to choose. Any suggestions

Try the dark blonde. You can always try a different color in a couple weeks if you aren't happy. Good Luck

Of those choices, I would select the 7N. But it really depends on what you want dear :)