How to Size Bathroom Vanity Lighting — A Designer's Guide
Most vanity lighting mistakes are sizing mistakes. The fixture is too small, mounted too high, or placed where it creates shadows instead of eliminating them. This guide covers the rules designers use to size and position bathroom vanity lighting correctly the first time.
The Width Rule
A vanity light bar mounted above the mirror should be 75–80% of the mirror's width. If your mirror is 48 inches wide, your light bar should be 36–38 inches wide. Going wider risks an awkward overhang. Going narrower leaves the edges of the mirror underlit.
If you're using a light bar that runs the full width of the mirror — or wider — you're following a different aesthetic logic (the Hollywood vanity look), and the rule loosens. But for a traditional or transitional installation, 75–80% is the standard.
Flanking Sconces: Mount Height and Spacing
Flanking sconces — one on each side of the mirror — give the most even light and the least shadow. This is the configuration professional photographers and makeup artists prefer for a reason: the light hits the face from both sides at eye level, eliminating downward shadows entirely.
Mount height for flanking sconces: 60–65 inches from the finished floor to the center of the fixture. This puts the light at or slightly above eye level for most adults. Lower than 60 inches and the light may catch the chin. Higher than 65 inches and it starts throwing shadows downward.
Spacing from the mirror edge: leave 18–24 inches of mirror between the sconce and the centerline of the mirror. On a 36-inch wide mirror, that means sconces are centered approximately 27–30 inches apart.
Single Fixture Above the Mirror
When a single fixture mounts above the mirror, mount the bottom of the fixture 6–8 inches above the top of the mirror. This is close enough that the light carries to the face. Any higher and the fixture becomes a ceiling ambient light, not a task light.
The fixture should direct light downward or diffuse it evenly — not bounce it upward off the ceiling. An opaque shade or downward-facing bulb position makes a significant difference here.
Bulb Placement and Color Temperature
For task lighting in a bathroom, use bulbs in the 2700K–3000K range. Warmer than 2700K reads as amber in mirrors. Cooler than 3000K reads as clinical and unflattering. The sweet spot is 2700K–2800K for residential bathrooms — warm enough to be pleasant, accurate enough to be useful.
CRI (Color Rendering Index) matters more in a bathroom than almost anywhere else. Use bulbs with a CRI of 90 or higher. Lower-CRI bulbs distort skin tones and make colors in clothing and makeup appear different than they will in daylight.
Common Mistakes
Overhead-only lighting. A single ceiling fixture above a vanity creates strong downward shadows under the eyes, nose, and chin. It is the least flattering light you can install in a bathroom. If ceiling fixtures are your only option, supplement with sconces at eye level or with a lighted mirror.
Mounting too high. Fixtures mounted at the ceiling line or at standard switch height (48 inches) in a bathroom setting produce poor task light. The 60–65 inch rule for sconces exists precisely because it positions the light where the work is happening.
Undersized fixtures. A small sconce on a large mirror looks unfinished and provides insufficient light. Scale the fixture to the mirror, not to a generic size.
Southern Lights Electric Vanity Fixtures
Our bathroom fixtures are designed with proportions that work in real installations — not showroom-sized rooms. Each is available in unlacquered brass, aged brass, flat black, and satin white. Custom sizing is available for non-standard mirror dimensions through the trade program.
All fixtures ship from our Nashville workshop. Lead time is 4–6 weeks on standard sizes.
Vanity Light Sizing Guide
How to Size Bathroom Vanity Lighting — A Designer's Guide
Most vanity lighting mistakes are sizing mistakes. The fixture is too small, mounted too high, or placed where it creates shadows instead of eliminating them. This guide covers the rules designers use to size and position bathroom vanity lighting correctly the first time.
The Width Rule
A vanity light bar mounted above the mirror should be 75–80% of the mirror's width. If your mirror is 48 inches wide, your light bar should be 36–38 inches wide. Going wider risks an awkward overhang. Going narrower leaves the edges of the mirror underlit.
If you're using a light bar that runs the full width of the mirror — or wider — you're following a different aesthetic logic (the Hollywood vanity look), and the rule loosens. But for a traditional or transitional installation, 75–80% is the standard.
Flanking Sconces: Mount Height and Spacing
Flanking sconces — one on each side of the mirror — give the most even light and the least shadow. This is the configuration professional photographers and makeup artists prefer for a reason: the light hits the face from both sides at eye level, eliminating downward shadows entirely.
Mount height for flanking sconces: 60–65 inches from the finished floor to the center of the fixture. This puts the light at or slightly above eye level for most adults. Lower than 60 inches and the light may catch the chin. Higher than 65 inches and it starts throwing shadows downward.
Spacing from the mirror edge: leave 18–24 inches of mirror between the sconce and the centerline of the mirror. On a 36-inch wide mirror, that means sconces are centered approximately 27–30 inches apart.
Single Fixture Above the Mirror
When a single fixture mounts above the mirror, mount the bottom of the fixture 6–8 inches above the top of the mirror. This is close enough that the light carries to the face. Any higher and the fixture becomes a ceiling ambient light, not a task light.
The fixture should direct light downward or diffuse it evenly — not bounce it upward off the ceiling. An opaque shade or downward-facing bulb position makes a significant difference here.
Bulb Placement and Color Temperature
For task lighting in a bathroom, use bulbs in the 2700K–3000K range. Warmer than 2700K reads as amber in mirrors. Cooler than 3000K reads as clinical and unflattering. The sweet spot is 2700K–2800K for residential bathrooms — warm enough to be pleasant, accurate enough to be useful.
CRI (Color Rendering Index) matters more in a bathroom than almost anywhere else. Use bulbs with a CRI of 90 or higher. Lower-CRI bulbs distort skin tones and make colors in clothing and makeup appear different than they will in daylight.
Common Mistakes
Overhead-only lighting. A single ceiling fixture above a vanity creates strong downward shadows under the eyes, nose, and chin. It is the least flattering light you can install in a bathroom. If ceiling fixtures are your only option, supplement with sconces at eye level or with a lighted mirror.
Mounting too high. Fixtures mounted at the ceiling line or at standard switch height (48 inches) in a bathroom setting produce poor task light. The 60–65 inch rule for sconces exists precisely because it positions the light where the work is happening.
Undersized fixtures. A small sconce on a large mirror looks unfinished and provides insufficient light. Scale the fixture to the mirror, not to a generic size.
Southern Lights Electric Vanity Fixtures
Our bathroom fixtures are designed with proportions that work in real installations — not showroom-sized rooms. Each is available in unlacquered brass, aged brass, flat black, and satin white. Custom sizing is available for non-standard mirror dimensions through the trade program.
All fixtures ship from our Nashville workshop. Lead time is 4–6 weeks on standard sizes.