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I would like to add a wall light to a wall, but I'm not sure the best way to go about doing this.

I'm thinking it will be easiest to wire it up to a ceiling light (directly above proposed placement of wall light), and just fix the cable to the wall and paint over it.

Is this a viable option? What would I need to check with regards to power consumption, and type of wires?

For matters of power requirements, I live in the UK, although answers specific to other countires are welcome too for other users who may read this question.

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What sort of wall light? Are you proposing the wire would be exposed on the outside of the wall? Is this meant to be a temporary installation? Is this in a finished living space, or a work area or garage? –  gregmac Jun 4 '11 at 19:37
    
As you are in the UK what you are proposing isn't sensible (or indeed legal) in a living area. –  ChrisF Jun 4 '11 at 20:00
    
Basically I have a short corridor that currently has plain white walls. I want to paint it a darker colour, and use it to display photos etc, and thought having a wall light to shine on a central photo would look good, instead of just using ceiling mounted spotlights. Thats why I'm not too concerned about being able to see the wire under the paint, as I could hide it under photos or whatever. Yes, the wire would be exposed on the outside of the wall, is that a problem? Thanks –  Connor W Jun 4 '11 at 20:42
    
I dont know of any other way to wire it up to power, other than to the ceiling light (Doing this also has the advantage of being able to turn it on and off with one switch) –  Connor W Jun 4 '11 at 20:44
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2 Answers

If you want them to turn on and off at the same time, yes, it's fine. If the floor above you is an attic, the job is relatively easy, otherwise call an electrician to do it.

You'll have to find a way to access the wires that go into the ceiling lights. Once you find them, turn off the breaker, and get some appropriately sized wire nuts to combine all of the wires together, including the new 12 AWG wires for the wall lights. You will need wire strippers and 3 wire nuts and combine the following together: hot (typically black), neutral (white), and ground (green.) There may be more wires involved, but at the very least, you will have the 3 wires in each of the 3 colors -- one wire coming from the breaker box (aka service panel), one wire going to the existing ceiling light fixture, and one wire for your new wall fixture.

Use a sheetrock knife to make the needed hole in the wall for the wall light. Then you can drill an extremely small (i.e. 1/8th-inch) drill bit into the ceiling above the fixture (assuming that the floor above is the attic) to let you know where the wall light is. Then go into the attic, remove insulation where you think the drill bit is, and then find it. Once it's found, drill a larger hole (3/8 to 1/2-inch) in the top plate (diagram) and feed the wall light wires into the hole. Once you feed enough wire into the hole to reach the opening that you've cut into the wall, fish them out. Cut the wires for the new wall light to an appropriate length, keeping in mind that you'll need extra length since it won't be going in a straight line and that you need extra length to make the wire nut connections. Secure the wires with staples... no, not the ones in your office stapler... ask at HDepot/Lowes/etc. if you can't find them.

From there, it is simply a matter of stripping the last inch or so of each wire, making the electrical connections (see instructions that came with the fixture), attaching the fixture to the wall (see instructions), and then turning on the breaker. Use wall putty to close up the tiny hole that you made in the ceiling.

Disclaimer: Unfortunately no guarantees can be made that the installation will be completely safe if you follow these instructions since I am forced to make assumptions and unforeseeable problems may exist that I have not thought of. I am not responsible for any consequences that arise or any inaccuracies in these instructions (especially since you live in the UK, not the US.) Hire an electrician if you want to be able to sue someone!

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It sounds like you want a picture light. And for covering the wire, all you need is a metal cord cover. This covers the wire hanging down the wall, and looks even better if you have it going behind a table or some other furniture so you don't see the plug and outlet. The light itself is switched and you don't have to fish wires through the wall.

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