Sounds like he wants you to screw some remodels thru the top into cieling drywall.
If they want pendant can light then hang them with 1 threaded rod in the center.
If they want a string of can lights put a hook on top to hang them and wire with SO cord.
I allways get those plastic coffee cans. Do you think they will work with a R-20 50 watt bulb?
You might want to ask for more information.
Tom