How to Determine Vanity Light Size | Width Rules That Work

Sizing a vanity light means choosing a fixture roughly 75% of the mirror’s width, centered over the sink zone.

Getting vanity light size wrong is the fastest way to make a well-designed bathroom feel off. A fixture that’s too wide crowds the mirror, while one that’s too small leaves the counter dim and shadows on your face. Whether you’re updating a powder room or finishing a full remodel, a few width rules and height guidelines settle the question. For a practical guide to finding the right size, measure your mirror, then check your vanity width before shopping.

The Basic Rule: Match the Light to the Mirror

The most reliable guideline is to choose a vanity light that is about 75% of the mirror’s width. A fixture at this proportion frames the mirror without extending past its edges, which keeps the whole arrangement looking balanced.

If the mirror width isn’t a useful guide — say it’s oversized or unusually small — size the fixture to the vanity cabinet instead. In that case, choose a light roughly one-third the width of the vanity. Either way, the light should stay within the mirror’s footprint or the sink zone it serves.

For purchases coordinated with a specific style, this is worth checking against the tested brass vanity light recommendations before finalizing a size.

Common Vanity Sizes and Their Light Widths

Retail sizing guides translate the percentage rule into practical ranges. For a typical single-sink bathroom, the fixture should be about 4 inches narrower than the vanity, leaving roughly 2 inches of breathing room on each side.

These are sizing and layout guidelines, not electrical code requirements. Your fixture must also match the bathroom’s wiring, mounting method, and moisture-location rating (damp-rated for most bathrooms, wet-rated for shower areas).

Double Vanities: Two Fixtures or One Long One?

For a double vanity, you have two good options. The simplest is to install two smaller fixtures, each centered over its own sink and mirror. This gives each person even light for grooming and avoids a long fixture that fights an awkward mirror split.

Alternatively, one long fixture can work if it’s proportionate to the combined mirror or counter width. Center it over the middle of the double vanity, and make sure it spans the full sink zone without extending past the outer edges of the mirrors. Two separate fixtures are usually the safer choice when the sinks are widely spaced.

Mounting Height: Where Should the Light Sit?

Mounting height matters as much as width. For a fixture above the mirror, the bottom of the light typically sits 6–8 inches above the mirror’s top edge. The fixture’s center should land around 75–80 inches from the finished floor, which keeps light directed at your face rather than your forehead or the ceiling.

For side sconces flanking a mirror, center each one at about 60–65 inches from the floor. That places the bulbs near eye level, minimizing shadows across your face. Mounting too high is a common mistake — it pushes light upward and reduces the facial illumination you actually need for shaving or makeup.

FAQs

What happens if the light is wider than the mirror?

A fixture that extends past the mirror edges looks unbalanced and is specifically discouraged in sizing guides. The light’s ends may also throw glare onto the surrounding wall. Stick with a fixture at about 75% of the mirror width, or switch to two side sconces if the mirror is narrow relative to the vanity.

How do you light a 60-inch double vanity?

For a 60-inch vanity with two sinks, two separate fixtures centered over each sink are the standard approach. A single 60-inch fixture is rarely proportionate unless it spans a single long mirror and is sized to the full mirror width, not the counter. Wall sconces or two small bars give the most even coverage.

Should the vanity light match the mirror width exactly?

No. A light that exactly matches the mirror width often feels heavy and can crowd the mirror visually. The recommended proportion is about 75% of the mirror width, which leaves a few inches of mirror visible on each side. If there’s no mirror, size to one-third of the vanity’s width instead.