Most vanity light returns have nothing to do with style. The fixture arrives, someone holds it up to the wall, and it is wider than the mirror, deep enough to block the medicine cabinet door, or fitted with a backplate that will not hide the marks left by the old fixture. Vanity light sizes and dimensions are a ten minute homework job with a tape measure, and doing that homework first saves you the cost of shipping a return across the country. Here is how to get the fit right the first time.
Standard vanity light sizes at a glance
Vanity lighting comes in a few basic formats, each with a typical width range. Manufacturers name fixtures by light count, but the count tells you less than the measured width, so always confirm the actual dimension on the spec sheet.
| Format | Typical width range | Common pairing |
|---|---|---|
| Single wall sconce | Roughly 11 to 20 cm (4.5 to 8 in) | In pairs flanking a mirror |
| 2-light bar | Roughly 30 to 41 cm (12 to 16 in) | Small mirrors, powder rooms |
| 3-light bar | Roughly 51 to 66 cm (20 to 26 in) | Single-sink vanities |
| 4-light bar | Roughly 71 to 91 cm (28 to 36 in) | Wider single vanities |
| 5-light and longer bars | Roughly 91 to 122 cm (36 to 48 in) and up | Double vanities, one long mirror |
These are category norms, not promises about any specific model. Canadian spec sheets usually lead with inches and list metric in brackets, so decide which unit you are working in and stick with it while you compare.
Measure the space before you browse
Five measurements settle almost every sizing question:
- Mirror width. The single most important number. Most fit rules key off the mirror, not the wall.
- Vanity width. Your outer limit. A fixture wider than the cabinet below it almost always looks wrong.
- Wall height above the mirror. Measure from the top of the mirror to the ceiling. A fixture with a tall body or an uplight orientation needs breathing room here.
- Junction box position. Note where the existing electrical box sits relative to the mirror centre. If it is off-centre, you need either a fixture with flexible mounting or an electrician to move the box.
- Obstructions. Medicine cabinet door swings, window trim, tile borders, shower glass. Note anything within about 30 cm of the fixture location.
If the mirror is not chosen yet, pick it first. Sizing the light before the mirror is guessing; our bathroom mirrors collection lists exact widths so you can lock that number down early.
The general fit rules
- Bar width: a fixture mounted above the mirror generally looks best at roughly three quarters of the mirror's width. Equal width reads acceptable on modern linear designs; wider than the mirror rarely works.
- Never wider than the vanity. Whatever the mirror allows, the cabinet is the hard stop.
- Mounting height: above-mirror bars are commonly centred in the range of 190 to 205 cm (75 to 80 in) off the floor, adjusted so there is a comfortable visual gap between mirror top and fixture. Let the mirror position drive the final number rather than a formula.
- Sconces: when they flank the mirror, aim for roughly eye level, which for most households lands between 150 and 170 cm (60 to 66 in) to the fixture centre. Pairs spaced closer to face width, not wall width, light a face more evenly.
- Double vanities: one long bar spanning both sinks, or two matched fixtures, one per sink zone. Two fixtures forgive an off-centre wall better than one.
Treat all of this as design guidance, not regulation. Fixture instructions and your local electrical code govern the installation, rules vary by province, and a hardwired swap is a job for a licensed electrician in most of the country.
Common fit mistakes
- Sizing to the wall instead of the mirror. A big empty wall tempts people into oversized fixtures that dwarf the mirror below.
- Ignoring projection. The width gets all the attention, but the extension, meaning how far the fixture stands off the wall, is what collides with a medicine cabinet door mid-swing. Check it whenever the fixture sits above or beside a door that opens.
- Forgetting the backplate. When replacing an older fixture, a new backplate smaller than the old one exposes paint shadows and anchor holes. The backplate dimension is on the spec sheet for exactly this reason.
- Buying by light count. One brand's 3-light bar can be wider than another's 4-light. Compare centimetres, not bulb counts.
- Missing the orientation note. Many bars install lights-up or lights-down, and flipping the orientation changes the fixture's effective height and where the glass sits relative to the mirror.
- Skipping the damp rating. Bathrooms are humid, especially in winter when windows stay shut from Whitehorse to St. John's. A damp-rated fixture is the safe default near a vanity.
How to read a vanity light spec sheet
Lighting brands we carry, including Kuzco, Alora, Matteo, Renwil and Bethel International, publish dimension sheets for nearly every fixture. Five lines matter most:
- Width (or length): the full end-to-end measurement, including glass shades that may extend past the frame.
- Height: top of the fixture to the bottom, in its installed orientation.
- Extension or projection: distance from the wall to the fixture's farthest point.
- Backplate or canopy size: the part that must cover your junction box and any old wall marks.
- Certification and rating: look for a CSA or cULus mark indicating the fixture is certified for use in Canada, plus the damp or wet location rating.
Also note whether the LED is integrated or the bulbs are replaceable, since an integrated fixture's output is fixed for its lifespan. In a Canadian winter, when the bathroom does the work a sunny window cannot, err toward more light: a longer bar or an extra sconce is easy to plan for now and hard to add later.
Where to go from here
Once your measurements are written down, shopping gets fast. Browse the bathroom and vanity lighting collection for bars and multi-light fixtures, or the wall sconces collection if you are flanking the mirror. Everything ships Canada-wide, from Vancouver to Halifax, and the rest of our sizing and buying advice lives in the Vatero guides hub.
Frequently asked questions
How wide should my vanity light be?
Start with your mirror: about three quarters of its width is the classic proportion, and matching the full mirror width can work with slim linear designs. Never exceed the width of the vanity cabinet. On double vanities, size each fixture to its own sink zone.
What height should a vanity light be mounted at?
Above-mirror fixtures are commonly centred around 190 to 205 cm (75 to 80 in) off the floor, but the honest answer is that the mirror decides. Set the fixture so there is a clean gap above the frame and the light falls on faces, not the wall. Sconces flanking a mirror sit near eye level. Follow the manufacturer's instructions and your local electrical code for the installation itself.
Are sconces or a light bar better for a small bathroom?
Sconces flanking the mirror light the face from both sides and reduce shadows, making them the quality choice where wall space allows. In a narrow powder room, common in older housing stock across Quebec and the Maritimes, there is often no wall left beside the mirror, and a compact 2-light bar above it is the practical answer. Neither is wrong; the wall decides.
Do vanity lights sold in Canada need special certification?
Fixtures sold for the Canadian market should carry a recognized certification mark such as CSA or cULus, which you will find noted on the spec sheet. For placement near tubs and showers, damp and wet location ratings apply, and provincial electrical codes set the installation rules, so confirm details with a licensed electrician rather than relying on general guidance.
