How bright should a reading lamp be?

Aim for roughly 300 to 500 lux at the page, which a 400 lumen bulb will give you comfortably at 400mm. Distance matters more than output, because light falls off with the square of the distance, so moving the lamp closer beats buying a brighter bulb.

Where should a reading lamp be placed?

Behind your shoulder and slightly to one side, with the bottom of the shade at or just below eye level when you are seated. That lights the page, keeps the bulb out of your sightline and avoids your own hand casting a shadow on what you are reading.

Does reading in a dark room damage your eyes?

No. It makes your eyes work harder, and the strain comes mainly from the contrast between a bright page and dark surroundings rather than from low light itself. Adding a little ambient light across the room is what makes an hour comfortable.

Should a reading lamp be warm or daylight white?

Warm, 2700K to 3000K, in a room that is otherwise warm, with a CRI of 90 or better. Daylight bulbs help with very small print but at 5000K and above they look like a fault next to warm lamps, and 3000K is the usable compromise.

Dark interiors

Lighting a dark room for reading, not for mood

3 November 2026 · 6 min read

Mood lighting and reading light are two different jobs and a dark room makes the conflict obvious. A page needs a decent amount of light landing on it from a source close by and slightly behind your shoulder. A dark room wants low, warm, diffuse light with no bright sources in view. Both are achievable in the same room, but not with the same fitting, and not by turning the mood lighting up. Here is where the lamp goes, how much light the page actually needs, and why the rest of the room matters more than the lamp does.

How much light a page needs

Lighting guidance for reading sits somewhere around 300 to 500 lux at the page for ordinary print, and higher for small print, old paper or anyone over about fifty, because the lens of the eye transmits less light with age. That sounds abstract until you convert it: a bedside lamp 400mm from the page with a 400 lumen bulb in it lands in that range comfortably. A single ceiling light three metres up does not.

Distance is doing most of the work. Light falls off with the square of the distance, so halving the gap between the bulb and the page roughly quadruples the light on it. Moving a lamp 200mm closer is worth more than doubling the bulb.

That is the whole argument for a task lamp rather than a brighter room. You can light a page properly with a very modest bulb if it is close, and that keeps the rest of the room dark, which is what you wanted in the first place.

Where the lamp goes

Behind your shoulder and slightly to the side, with the bottom of the shade at or just below eye level when you are sitting. That position puts light on the page, keeps the bulb out of your sightline, and avoids the shadow of your own hand falling across what you are reading.

For a chair, that means a floor lamp set behind the arm rather than beside the seat, or a table lamp on a side table with the shade bottom around 1.0m to 1.1m from the floor. If you can see the bulb when you are sitting normally, the shade is too high or the lamp is too far forward.

In bed it is different, because you are reclining and the page is close to your chest. A wall mounted light or a swing arm at roughly shoulder height when you are propped up, angled down onto the book, beats a table lamp with a wide shade, which mostly lights the ceiling and your face. Anything adjustable is worth more here than anything decorative.

If you share a bed, directional matters more than brightness. A narrow beam onto a page is far less disturbing to somebody trying to sleep than a dim lamp throwing light everywhere.

Contrast is what tires your eyes, not dimness

Reading in low light does not damage your eyes, which is worth saying plainly because it is one of the longest running pieces of domestic folklore. What it does is make them work harder, and what makes them work hardest is not the overall level but the difference between the bright page and the dark surroundings.

Your pupil sets itself to an average of the whole scene. With a brightly lit page in a black room, the pupil is caught between two demands and keeps adjusting every time your eyes leave the page, which is the mechanism behind the tired, strained feeling after an hour.

The fix is cheap: add a small amount of ambient light so the room is not black. A dim lamp across the room, or a wall washer at low output, lifts the surroundings enough that the page is no longer an island. In a dark room this is the step that turns an uncomfortable reading corner into a usable one, and it means you can run the task lamp lower than you expected.

A rough target is the surroundings at something like a third of the brightness of the page. You do not need to measure it. If looking up from the book is a jolt, there is not enough ambient light.

The bulb, not the lamp

For a task light, 2700K or 3000K is right. Daylight bulbs are often recommended for reading and they do help with very small print and with colour accuracy, but at 5000K and up in an otherwise warm dark room the mismatch is glaring and looks like a fault. If you need the extra crispness, 3000K is the sensible compromise.

CRI of 90 or better is worth paying for on a reading lamp, because low rendering bulbs make printed black look washed and grey paper look greener than it is. It is also the bulb you will look at under for an hour at a time, which is more than you can say for a hallway fitting.

Diffusion matters as much as output. A bare bulb or a clear filament bulb in a reading lamp puts a hard bright source in the edge of your vision and causes exactly the adaptation problem described above. A frosted bulb inside an opaque shade with a wide open bottom puts light where you want it and nowhere else.

Flicker is the last one. Cheap dimmable LEDs on a cheap dimmer can flicker at a rate you cannot see but can feel over an hour. If a reading lamp gives you a headache and nothing else does, change the bulb before you blame the book.

Making a task lamp not ruin a dark room

The thing that spoils a dark room is a bright source in view, so put the reading light on its own switch and run it only when somebody is reading. A room with one lamp doing both jobs will be either too bright all evening or useless for a book.

Choose fittings that aim rather than spill. An opaque shade, a hooded head, a swing arm, a proper reading lamp. Avoid wide pale shades in a dark room, which glow and become the brightest object in the room from every angle.

Keep the reading corner's surfaces useful rather than decorative. A surface at arm height for the book, the glass and the reading glasses is what turns a chair into a place somebody actually reads, and it stops the lamp table becoming a display. A glasses holder does the specific job of keeping spectacles off the seat of the chair, which is where they otherwise get sat on.

If you also want candlelight in the same room, keep it as a separate layer in a separate place. A candle gives out very little light, nowhere near enough to read by, and a pair of candlesticks on a shelf across the room is doing a different job from the lamp. Keep flames away from the chair you are reading in, nothing combustible within about 100mm, and put them out when you leave the room.

A reading corner in a dark room, in order

Start with the chair and the direction you will face, because every other decision follows from it. Then the task lamp, behind the shoulder, on its own switch. Then one ambient source across the room to kill the contrast. Then a surface within reach.

Only after that is it worth thinking about anything decorative. The most common mistake in a dark reading corner is three atmospheric lamps and nothing you can read by, which produces a corner that looks like a reading corner and is used for sitting in the dark.

Test it by reading in it for twenty minutes rather than by looking at it from the doorway. If you find yourself tilting the book to catch the light, the lamp is in the wrong place, and no amount of extra output will fix a position.

Questions people actually ask

How bright should a reading lamp be?: Aim for roughly 300 to 500 lux at the page, which a 400 lumen bulb will give you comfortably at 400mm. Distance matters more than output, because light falls off with the square of the distance, so moving the lamp closer beats buying a brighter bulb.
Where should a reading lamp be placed?: Behind your shoulder and slightly to one side, with the bottom of the shade at or just below eye level when you are seated. That lights the page, keeps the bulb out of your sightline and avoids your own hand casting a shadow on what you are reading.
Does reading in a dark room damage your eyes?: No. It makes your eyes work harder, and the strain comes mainly from the contrast between a bright page and dark surroundings rather than from low light itself. Adding a little ambient light across the room is what makes an hour comfortable.
Should a reading lamp be warm or daylight white?: Warm, 2700K to 3000K, in a room that is otherwise warm, with a CRI of 90 or better. Daylight bulbs help with very small print but at 5000K and above they look like a fault next to warm lamps, and 3000K is the usable compromise.