I want to replace my 40 year old spot light cans with LED lighting. My issue: the cans are 6 inch and not very deep. They are bell shaped and lack the tension spring clips which wouldn't work anyway as the cans slope inward like a bell. So I will use the shallow mount lights instead with the cans removed. What remains is the rest of the can assembly which has a junction box with a flexible metal cable (BX?) running the bulb socket. I will remove the bulb socket. It only has black and white wires and no ground. May I screw the ground to the LED junction box and does the flexible metal cable act as a ground? I didn't look real closely at the junction box but could see bare copper wires which I assume are ground wires. I do have attic access but want to do this quickly, cheaply and safe.
the equipment grounding conductor terminates inside the junction box attached to the can Bracket/housing.
the "Armored cable" just delivers the Hot and Neutral to the light socket.
there are, available on the market, LED retro fit lights for this situation.
here is a search for "LED retro fit" https://www.homedepot.com/s/led%2520retro%2520fit?NCNI-5