If you fill the whole thing with 16 plants you will end up with what is  called a Sea of Green (SOG) grow.  The plants will stay small but you'll  have a lot of plants.  I'm just getting into hydro myself but given my  experience in soil less growing, a plant in a 3 gallon pot can get 2'  high and spread over a 15" diameter area.  Someone else with some hydro  SOG experience may feel differently, but I don't see that system being  capable of growing more than about 8 plants max.  
A Blackstar 240 watt LED would be perfect for that size table.  About $280 from Gotham Hydro.  You're also going to need a carbon filter on your exhaust fan.  A 4" one should be good for that size space.