Depends on what type of lights you need. Some people just use downlight throughout the house. Will cost about $1k+ If you add in cove lights (T5) maybe another $500 depending on how many you need. Mix in 1 or 2 chandeliers will cost you another $200-$700 depending on what you choose. For lighting, must remember not to just go for the cheapest or listen to whatever claim the salesman tell you. Ask for warranty. Without good warranty, all is bull**** one. For LED downlight (very popular nowadays), at least must have 2 year onsite warranty. Or else not worth it. Cos the savings will only come after 1 year+. Onsite warranty is important because it will take away all worries. Isn't it good to have all problems fixed by simply making a phone call.