Example: If the existing fixture uses (4) 100-watt bulbs. If you plan to add lights that use more watts than the existing fixture, have an electrician determine what the circuit can carry. How many lights are you adding? You can add lights that draw as many watts as the existing fixture without overloading the circuit. Insulated ceiling cans cost a little more initially, but easy installation and added fire safety make them a good investment, that pays for itself in the long run. If the existing wiring is fabric-insulated or has no ground wire, have a licensed electrician inspect it to determine if the wiring should be replaced. What kind of wiring do you have? Is the existing wiring aluminum or copper? Use wiring that is the same material and gauge (thickness) as the existing wire. Special, remodeling cans are needed and the wire has to be fished through the ceiling If you aren't comfortable performing electrical work, hire a licensed electrician. If there's another floor above, the project is more involved. You can probably use recessed light cans with standard housings and running the electrical cable is very simple. What's above the ceiling? If an attic is above the ceiling, the project is pretty straightforward. Eyeball lights are very good for task lighting or focusing attention on particular items in the room. Eyeball lights are mounted on a swivel and can be positioned to highlight different areas. In an 8-ft ceiling install the lights no more than 6-ft to 7-ft 6-in apart. Space the down lights so the distance between lights is no more than 75% to 95% of the ceiling height. The cones of light should overlap for maximum effect. The cone for a 100-watt light in an 8-ft ceiling is usually 8-ft in diameter at the floor. What effect do you want from the lighting? Down lights project a cone of light straight down. Consult a licensed electrician before adding lights to a new circuit to ensure that the added power requirement does not overload the circuit. If no existing fixture exists, you may pull power from another circuit or add a new circuit to the main electrical panel. From the Lowes site: Planning Your Recessed Lighting Before you begin, think about the effect you want to achieve and how best to obtain it.
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