Guide · Dark rooms

How to get natural light into a north-facing room

North-facing rooms get no direct sun for half the year, so they stay flat and grey even at noon. You can make a dark room feel brighter with paint and mirrors - but to add actual daylight, you have to bring the sun to the room. Here's the honest run-down of every option.

Why north-facing rooms stay dark

In the northern hemisphere the sun travels across the southern sky, so a north-facing window only ever receives soft, indirect light. Tall buildings, trees or a deep floor plan make it worse. No amount of artificial lighting replaces the warmth and the biological quality of real daylight - it just adds more lamps.

The options, from cheapest to most effective

1. Lighten the room (free-cheap)

Pale, matte wall paint, a large mirror opposite the window, light flooring and minimal window dressing all help the existing daylight go further. This is the right first step - but it only redistributes the little light you already have.

2. Bigger or new windows (expensive, structural)

Enlarging a window or adding one helps, but it's costly, needs permits, and on a north wall still only collects indirect light.

3. Skylights and light tubes (moderate, fixed)

A roof skylight or a tubular "sun tunnel" (e.g. Solatube) pipes daylight down from the roof. Effective for top-floor rooms - but they require building work, can't be aimed or switched off, and do little when the sun is low in winter. (See our heliostat vs. Solatube comparison.)

4. A sun-tracking heliostat (active, retrofittable)

A heliostat is the only option here that brings direct, real sunlight into a room that never sees the sun. Mounted outside, it follows the sun and redirects steady sunlight through your existing window onto a wall, the floor or a desk - and it keeps following as the seasons change.

What a heliostat actually changes

• Real daylight, not a lamp. A warm, moving patch of genuine sunlight - the light that lifts a room and your mood.
• No renovation. It mounts outdoors and uses the window you already have; no roof or wall work.
• You aim it. Set the target in an app; schedule different spots for different times of day.
• It works in winter too. When the low sun would otherwise miss the room entirely, the mirror still catches and redirects it.

What to realistically expect

Real daylight is wonderful precisely because it's alive - which also means it follows the sun and the weather. Being honest about that is part of choosing well:

• A moving patch, not a floodlit room. A heliostat lands a calm area of real daylight where you aim it, for the hours the sun reaches the mirror - it won't turn a north-facing room into a south-facing one.
• It follows the weather. On a heavily overcast day there's little direct sun to redirect. It adds the real daylight that does reach your property; it doesn't manufacture sun.
• Broad light, no hot spot. The mirror is slightly convex and creates no focal point. Glare is handled by no-glare zones in firmware, a safe park position and the siting notes you follow at installation.

Frequently asked questions

Will a heliostat make my north-facing room as bright as a south-facing one?

No. It lands a calm, moving patch of real daylight where you aim it, for the hours the sun reaches the mirror - it won't flood the whole room or replace the sun on a heavily overcast day.

Is the redirected sunlight safe, or does it create a hot spot?

No. The mirror is slightly convex and creates no focal point, so the room receives a broad area of daylight and no hot spot forms. Glare is handled separately and by three measures - no-glare zones enforced in firmware, a safe park position, and the siting notes you follow at installation. Two of them are in the device, the third one is yours.

Do I need any construction or roof work?

No. The heliostat mounts outside and uses your existing window; nothing is built, cut or drilled indoors.

Does ohoya use a camera or the cloud?

The device has no camera, ever (the app uses your phone's camera only for the one-time AR setup, images stay on your phone), and no cloud is required - everyday operation works without an internet connection.