In a bathroom with no window, every bit of light comes from the fixtures. And the place it matters most isn't the ceiling. It's the mirror.
Light the mirror first
Shaving, make-up and checking your skin all happen at the mirror. If the only light is overhead, it throws shadows down your face. The light at or around the mirror is the one to get right.
The right bulbs
- 3000K soft white. Warm enough not to feel clinical, crisp enough to see by.
- CRI 90 or higher. In a room with no daylight, this is what shows skin and make-up as they really are.
- The same color in every fixture in the bathroom.
For most renters, this is the whole job: swap the bulbs in the fixtures you already have. Check each fixture's bulb base and maximum wattage first.
How much light
The commonly cited level for a bathroom is 20 to 50 foot-candles. A 5 x 8 foot bathroom is 40 square feet, so about 800 to 2,000 lumens, mostly at the mirror.
A light for the middle of the night
A small battery motion night light, low on the wall, comes on when you walk in at 2 am and switches itself off. No glare, and you don't have to find a switch in the dark.
The one safety rule
No plug-in lamps near the sink, bath or shower. Water and plug-in lamps don't mix. Swap bulbs in the fixtures that are already there, and use battery lights for anything extra.
If you plug in anything near water at all, such as a hair dryer, use the outlet with the test and reset buttons, a GFCI outlet in the US.
Make it feel brighter
- White or pale tiles and walls bounce more light.
- A larger mirror spreads the light you have.
- Keep the mirror light on a timer or smart bulb if it's on a fixture that allows it, so mornings start bright.
Ventilation note
A windowless bathroom relies on its extractor fan. Run it during and after showers. It's not a lighting tip, but it keeps the room, and the light fixtures, free of damp.
Mistakes to skip
- Only a ceiling light. It shadows your face at the mirror.
- Cool daylight bulbs. They make a small windowless room feel like an office restroom.
- Plug-in lamps on the counter.
FAQ
What is the best lighting for a bathroom with no window? Even light at the mirror with 3000K, CRI 90 bulbs, a matching ceiling light, and a battery night light for nights.
What color temperature for a windowless bathroom? 3000K is a good choice. Keep every bulb in the room the same.
Can you use a lamp in a bathroom? Not a plug-in one near water. Battery lights are the renter-safe option for extra light.
Every room, every bulb
The Lamp Plan, No. 04 in the Decorwick Measured Home Series, has the windowless bathroom as a full recipe, with the exact bulbs, lumens and budget, plus 13 more rooms. See The Lamp Plan
