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.