Glare: why good light never hurts your eyes
Glare is the reason a beautiful lamp can still feel wrong. How direct and reflected glare arise, what shielding angles and UGR mean, and how shades, height and placement keep light comfortable.
You notice glare before you can name it. You squint at a bare bulb above a dining table, turn away from a downlight while lying on the sofa, or tilt a laptop because a lamp is reflected in the screen. Good lighting is the opposite: you see the light on the table, the wall and the faces around you, but not the source that creates it.
Many of the most admired lamps of the last century, from Poul Henningsen’s layered shades onwards, are at heart clever answers to glare. Understanding why it happens makes it surprisingly easy to avoid at home.
What glare is
Glare happens when something in your field of view is much brighter than the surroundings your eyes have adjusted to. The key is contrast, not brightness alone. Car headlights are dazzling at night and barely noticeable at noon, because the background is so different.
Lighting designers distinguish two kinds. is irritating and tiring without stopping you from seeing: the bare bulb at the edge of your vision. Disability glare actually reduces what you can see, like low sun on a wet road. At home, almost all glare is of the first kind, and it is often the reason a room feels restless even when there seems to be enough light.
Direct and reflected glare
Direct glare comes straight from the light source: an unshaded bulb, a downlight you can look into, an LED strip whose individual dots are visible, a pendant hung so high that its bulb is at eye level from the sofa.
Reflected glare arrives via a shiny surface. Polished stone, lacquered tables, glass, glossy kitchen fronts and screens all act as mirrors. The source may be well hidden, yet its reflection lands in your line of sight. A special case is the on a screen or glossy page, which washes out contrast and makes reading tiring. Typical causes at home include:
- Clear bulbs in open shades, seen from the side or from below
- Pendants hung too high over a table, so the bulb shows from a seated position
- Shallow downlights above sofas, beds and baths, where people look up
- LED strips without a , mirrored as dotted lines in glossy worktops
- A desk lamp placed where its reflection appears in the monitor
- A single very bright light in an otherwise dark room
Shielding, diffusers and louvres
There are three main ways to keep a bright source out of sight. The first is shielding: hiding the source behind a shade, a reflector or a deep recess. The , sometimes called the cut-off angle, describes how far you have to look up towards a fitting before you see the bright source itself. The larger the angle, the less often the source catches your eye.
The second is diffusion. A diffuser is a translucent cover, such as opal glass, frosted acrylic, paper or fabric, that spreads light over a larger surface. The light feels softer because the same amount of light now comes from a bigger, less intense area.
The third is the : small blades or a honeycomb grid inside a fitting that block light at shallow angles while letting it pass downwards. You find them in good spotlights and linear fittings, and they make a remarkable difference in kitchens and for art lighting.
| Solution | How it works | Where it helps |
|---|---|---|
| Deep recess | Sets the light source far back inside the housing | Downlights above seating, beds and baths |
| Layered or closed shade | Blocks the direct view of the bulb from most angles | Dining pendants, hallways and stairwells |
| Opal or frosted diffuser | Spreads light over a larger, softer surface | Ceiling lights, wall lights, mirror lights |
| Louvre or honeycomb grid | Cuts off light at shallow angles | Spotlights, track lights, picture lighting |
| Indirect light | Bounces light off a wall or ceiling first | Living rooms, bedrooms, coves |
| Frosted or opal bulb | Replaces a clear filament with a softer glow | Open shades seen from below |
UGR in plain words
In offices and public buildings, glare is assessed with the (UGR), a method adopted by the International Commission on Illumination (CIE). It estimates how much discomfort glare people will feel from all the fittings in a room, taking into account their brightness, size and position and the brightness of the background.
Lower numbers mean less glare. In practice the scale runs from around 10, where glare is barely noticeable, to the high 20s, where it becomes clearly uncomfortable, and limits are usually set in steps of three: 13, 16, 19, 22, 25, 28. The European standard for workplace lighting, EN 12464-1, uses UGR 19 as the limit for reading and writing in offices and a stricter 16 for technical drawing, while corridors and circulation areas may have higher values.
You will see UGR on the datasheets of professional fittings, often written as “UGR ≤ 19”. Strictly, the real figure depends on the whole room, so a manufacturer’s value refers to a standard reference room. It is still a useful sign that a fitting was designed with glare in mind, especially for a home office or a kitchen with linear lights.
Placement, height and shades at home
Most glare at home is solved with position rather than technology. Over a dining table, hang pendants so that the lower edge of the shade sits roughly 60 to 75 cm (24 to 30 inches) above the tabletop: low enough to hide the bulb from seated diners, high enough to keep the view across the table open. Choose shades that are deep enough, or closed enough, to hide the source.
Think about where people look. In bedrooms and living rooms you often look up from a lying or reclining position, so avoid downlights directly above beds, sofas and baths, or choose deeply recessed models. Table and floor lamps should hide the bulb from both standing and sitting positions; a shade whose lower edge sits at about the eye height of someone seated is a good rule.
Screens and glossy surfaces
Screens are mirrors with a picture on them. Place a desk so that windows are to the side rather than directly behind you or behind the screen, and position a task lamp beside the monitor with its head angled down onto the desk, on the side opposite your writing hand. A little background light around the screen reduces the contrast between a bright display and a dark room, which most people find more comfortable in the evening.
With glossy floors, lacquer and polished stone, favour indirect and diffused light, and keep bright points out of the mirror angle as seen from where people sit. Matt finishes on ceilings and walls help too, because they spread reflected light evenly instead of creating hot spots.
Good light shows you the table, the wall and the faces around you, never the source itself.
glaminia is independent and does not sell lamps or recommend dealers. Images are AI generated illustrations, not photographs of specific products. Have fixed electrical work done by a qualified electrician.
