The short answer
Three rules do most of the work. Put the task lamp on the opposite side from your writing hand, so your own hand stops casting a shadow on the page. Never put the brightest light directly behind or directly in front of the monitor — one silhouettes the screen, the other bounces straight back into your eyes. And run 4000K while you work, not the 2700K you'd use anywhere else in the house. Cool-neutral light keeps you alert; warm light is for winding down, which is the opposite of the job.
Where the light goes
| Position | Effect | Verdict |
|---|---|---|
| Opposite your writing hand | No hand shadow on the page | ✅ Do this |
| To the side of the monitor | Even light, no screen bounce | ✅ Do this |
| Behind the monitor (soft, dim) | Lifts the dark wall behind the screen | ✅ Reduces contrast strain |
| Directly behind the screen (bright) | Silhouettes the monitor, eyes fight it | ❌ Avoid |
| Directly facing the screen | Reflects off the glass into your face | ❌ Avoid |
| Overhead only | Shadows under everything, flat and tiring | ❌ Not on its own |
The desk lamp does the real work
An overhead alone gives you a room, not a desk. A table lamp with a directional head — the modern LED desk lamp is the type — is the piece that actually earns its place: sit it opposite your writing hand — left side if you're right-handed — and set it so the bottom of the shade sits near eye level when you're seated, roughly 15 inches (38 cm) above the desk surface. Below that it glares; above it, it spills across the screen.
If you read paper and screen in the same session, an adjustable arm is worth more than any other feature. You'll move it ten times a day.
Screens change the rules
Every other room wants light on things. A desk with a monitor wants light around them. The bright thing in front of you is already emitting — so the room's job is to stop that screen from being a glowing rectangle in a dark cave, which is what makes eyes ache by 4pm.
That means a soft, dim light behind the monitor — a low wall light or a small lamp on the shelf behind — to lift the wall closer to the screen's brightness. Not bright; just not black. A pair of wall lights either side of the desk does the same job without ever touching the glass; an adjustable-arm one like the Duckbill lets you point it away from the screen entirely. Keep a diffused ceiling fixture as the base layer and you have all three; our layering guide covers how they stack.
Warm light is for after work
2700K is a lovely bulb and a poor colleague. 4000K is the working number — neutral, awake, closer to daylight, and it keeps the afternoon from turning into a nap. The trade-off is that the room stops being cosy the moment you close the laptop, which is exactly what dimmers and a second warm layer are for: see the dimmable lighting guide for what actually dims without flicker, and the colour temperature guide for the numbers.
FAQ
Which side should a desk lamp go on? The opposite side from your writing hand — left if you're right-handed. Otherwise your hand shadows whatever you're writing on.
What colour temperature is best for a home office? 4000K while you're working. It's neutral and alert. Save 2700K for the rest of the house, or add it as a second layer for the evening.
Should a light go behind my monitor? Yes, if it's soft and dim — it lifts the wall behind the screen and cuts the contrast that tires your eyes. A bright light back there does the opposite and silhouettes the screen.
Is a ceiling light enough on its own? No. Overhead-only light drops shadows under your hands and flattens the room. It's the base layer, not the whole answer.