We have lived in Spain for 2 years and have now brought 2 apartments, in both, the lights where not part of the contract (which is quite normal in new houses in Spain) Fortunately, I am an electrician and fitted them myself.
You can buy from a lighting company, with labour included, can be expensive. Or you can buy your own lights from IKEA, Carrafours, Leroy Merlin, etc, who stock a wide range at very competative prices and have them fitted.
If you need any advice or help on living in Spain give us a call on 0034 616009262, Roy & Janet