Hi,
I don't have the LEd strtip, but to give you an idea, 80gsm is the kind of paper you would use normally in your printer at home. 170 satin would be the kind of thing that you would get through your letterbox as maildrops, flyer, takeaway menus, that sort of thing. Satin means it's glossy.
I would guess that the satin is a better option, I think the light would be too strong on the 80. Try printing a picture on your own printer at home and put it up to the LED strip, you should have a better idea then.
Hope this helps
Mfl