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A good desk lamp puts light on the work without putting glare on the screen or in your eyes. OSHA wants the monitor perpendicular to windows and not washed by overhead bounce. IES-derived office practice keeps computer-task illuminance from exceeding about 500 lux on average. Geometry, shade, and a dimmer do that job. A lumen number on a box does not.
The argumentA desk lamp is a placement tool. OSHA's computer-workstation guidance treats glare as a posture problem: people lean and twist to escape it. The monitor should sit perpendicular to windows, and a screen tilted back catches overhead light. A lamp that floods the room or specular-hits the display recreates that hazard on purpose. Illuminating Engineering Society practice, as summarized in occupational lighting guides, has long put ordinary office computer work in a few hundred lux, and has warned that average illuminance where screens predominate should not exceed about 500 lux. So a good lamp is aimed, shaded, dimmable, and parked opposite the writing hand. Wattage and a halo of 'eye-care' marketing are the Reviews spec-sheet's problem. This page is the geometry.
I already know to look at lumens and CRI. What actually makes a lamp work on a desk with a computer, instead of just lighting the room?
Light the task, not the monitor. OSHA: glare on the screen makes people sit wrong. Place the lamp so the beam does not bounce into your eyes from the display.
Where computer work predominates, more light is not better. IES-derived office practice has treated about 500 lux as a ceiling for average illuminance in those rooms, with task lights for paper.
Shade, arm, and dimmer are the mechanics. A bare bulb in the sightline is a bad lamp regardless of CRI.
Park the lamp on the opposite side from the writing hand so your hand does not shadow the page. Left-handed: lamp on the right.
The Reviews companion, What to look for in a desk lamp, is the box: lumens, kelvin, CRI, flicker. This page assumes you can buy a decent LED and asks whether the object in your hand will behave on a desk that also has a computer. Most 'desk lamps' are small room lights. They raise the whole field, bounce off a glossy screen, and leave the keyboard in your own shadow. A good one is a directional tool with a dimmer.
OSHA's monitor chapter is mostly about the display, which is the point. People do not sit in strange postures because they lack discipline. They sit that way to escape glare. A lamp can be the glare.
Only one of them is the job.
Page, notebook, keyboard, parts you are assembling. This is what the shade should confine. Dim until the paper is easy and the screen still has contrast.
A specular hit turns the monitor into a mirror. OSHA: a screen tilted back catches overhead fixtures. A lamp behind you or high and naked does the same from a closer range.
If you can see the bulb, the lamp is in the sightline. Opaque or deeply recessed shade. The glowing 'halo' some lamps advertise is often a glare source with a wellness name.
| Trait | Why it matters at a computer desk |
|---|---|
| Opaque shade, beam you can aim | Task light, not a lantern. Translucent globes light the room and the ceiling, which is a living-room move. |
| Arm that stays where you put it | You will move it when the screen or the paper moves. A collapsing arm becomes overhead glare. |
| Dimmer (or at least two levels) | Paper wants more light than a dark-theme editor. One brightness cannot do evening email and tax forms. |
| Opposite the writing hand | Right-handed: lamp on the left, so the hand does not throw a shadow across the line. Reverse if you write left-handed. |
| Does not fight the window | OSHA: monitor perpendicular to the window. Do not add a lamp that mirrors the window's glare from the other side. |
Occupational lighting guides that adapt the IES handbook put ordinary high-contrast desk work in a few hundred lux, and they quote ANSI/IESNA RP-1-04: where computer tasks predominate, keep average illuminance from exceeding 500 lux so the screen still has contrast, and add task lighting for paper. You do not need a meter to use the idea. If the display looks washed out when the lamp is on, the lamp is too flood-y or too bright. Dim it or aim it down.
CRI and color temperature still matter, and they are specified in the Reviews piece: cooler, high-CRI light for color-critical work, warmer for evening. Do not buy a 5000 K flood for a desk you use after dinner unless you like feeling like a pharmacy. How to choose bedside lighting is the sleep-room version of that instinct. How to improve lighting in a rental is the apartment-wide version.
Clamp versus base is furniture. A clamp saves the desk and needs a lip. A heavy base survives a bump. Neither fixes a bare bulb. Buy the mechanics first, then match lumens using the other article.
Hit the page. Miss the screen. Hide the bulb.
Computer-heavy desks do not want a flood. About 500 lux average is the IES-derived caution, not a target to beat.
Lamp opposite the writing hand.
Overheads are the glare OSHA worries about when the screen tilts back. A dimmable overhead plus a small task lamp is the usual adult setup. One blazing ceiling disc is a classroom.
It can light the desk without occupying the surface, if it does not reflect in a glossy screen. Treat it as a beam you still have to aim. It does not replace a lamp for paper off to the side.
No. Color-critical work (print, makeup, product photos) wants high CRI. Code wants contrast and no flicker. See the Reviews spec sheet for numbers.
Sources and further reading
Monitor at least 20 inches away, top at or below eye level, perpendicular to windows. Screens tilted back catch overhead glare. Glare leads to eyestrain and awkward postures.
Adapts IESNA recommended ranges (e.g. 200-500 lux for high-contrast or large-scale visual tasks). ANSI/IESNA RP-1-04: where computer tasks predominate, average illuminance should not exceed 500 lux to minimize screen contrast problems; use task lighting for paper work. CRI 70+ general, 85+ if color-critical.
Continue reading
The wattage on a desk lamp's box describes what it costs to run, not how much light it produces or how comfortable that light is to work under for eight hours; lumens, color temperature, and CRI do the real predicting.
Reviews / Comparisons / 8 min
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