How to Light a Gallery Wall or a Single Piece of Art

Art lighting has a reputation as a gallery problem, which keeps most people from attempting it at home. In practice there is one angle to get right, one type of bulb to avoid, and one habit worth breaking, and the rest is arithmetic.

The 30 degree rule, and why it exists

Aim light at the centre of the artwork from 30 degrees off vertical. That is the number to remember, and it is a compromise between two failures.

Light the piece from straight above, at zero degrees, and a framed work throws a hard shadow from its own frame down its top edge, and any texture in the surface, canvas weave or brushwork, casts long shadows and turns the piece into a relief map.

Light it from too far out, at 45 degrees or more, and the beam hits glass at an angle that bounces straight back at anyone standing in front of it. You get a bright rectangle instead of a picture.

Thirty degrees clears the frame, keeps the reflection below the viewer's eyeline, and still rakes lightly enough to show texture without exaggerating it.

Add five degrees for a deep frame or a heavy canvas edge, and take five off for anything behind glossy glass.

Turning 30 degrees into a measurement

You do not need a protractor. The rule of thumb:

Distance from the wall equals roughly 0.6 times the height of the light above the centre of the artwork.

A worked example. Standard ceiling at 240 cm, centre of the picture at 150 cm. The difference is 90 cm, so the light wants to be about 55 cm out from the wall. With a 300 cm ceiling and the same picture, the difference is 150 cm and the fitting moves to about 90 cm out.

For a wall mounted picture light sitting directly above the frame, the arm length does the work instead, and 20 to 30 cm of projection suits most framed pieces up to about a metre tall.

Three ways to do it

Picture lights. A slim fitting mounted on the wall just above the frame, or on the frame itself. Simple, self contained, and it works in a rented flat with a plug-in version. Best for a single significant piece. It lights the top of the work more than the bottom, which is fine up to about a metre of height and noticeable beyond it.

Adjustable wall spots. A directional fitting mounted on the wall or ceiling and aimed. The most flexible option, and the right answer when the art changes. Something like the Scope Adjustable Wall Spotlight can be re-aimed in seconds when you rehang.

A row of wall lights. For a gallery wall of many small pieces, individually lighting each one is absurd. Instead wash the whole wall evenly with three or four fittings spaced along it, and accept that this is wall lighting rather than art lighting. It is the right choice for a hallway gallery wall, and the spacing logic is the same as in hallway and staircase wall light spacing.

Beam angle: the spec that decides whether it looks good

Beam angle is how wide the cone of light spreads, in degrees. It is printed on the bulb box and ignored by almost everyone.

• Narrow, 10 to 24 degrees. A tight spot. For one small piece you want to isolate.
• Medium, 25 to 40 degrees. The general purpose art angle. Covers a normal framed work from a normal distance.
• Wide, 60 degrees and up. For washing a whole wall or a gallery arrangement.

The quick check: at a distance of one metre, a 24 degree beam covers about 40 cm and a 38 degree beam about 70 cm. Match the spread to the width of the piece and you get a lit picture. Use a narrow beam on a wide painting and you get a bright spot in the middle with dark corners.

Brightness and colour, where art is unusually fussy

CRI 95 or above. This is the one place where 90 is not enough. Colour rendering is literally the point: a low CRI source will shift reds and flatten subtle colour, and you will have bought a painting you cannot actually see.

2700K to 3000K for most work. Oil paintings and warm palettes sit best at 2700K. Photography, print and cool palettes can take 3000K to 3500K. Do not go above 4000K.

Three to five times the ambient light level. That is the ratio that makes a piece read as lit rather than merely visible. If the room sits at 100 lux, aim for 300 to 500 lux on the work. Brighter than that and it stops looking like part of the room.

No UV, and keep it modest on anything on paper. LED emits effectively no UV, which is one of the genuine advantages over halogen. Watercolours, prints and photographs still fade under sustained visible light, so put art lighting on its own switch and do not leave it on all day.

The habit worth breaking

Most people hang art too high and then light it from wherever there happens to be a fitting. Both are backwards.

Hang the centre of the piece at about 145 to 150 cm from the floor, which is average standing eye level and the height galleries use. Then place the light for that. A picture hung at 170 cm, lit from a downlight three metres away, is the standard living room arrangement and it is why so much home art looks dull.

If the art is over a sofa, drop the centre to around 140 cm so it relates to the furniture rather than floating above it.

Frequently asked questions

What angle should a light hit a painting?

Thirty degrees from vertical, aimed at the centre of the piece. Add five degrees for a deep frame, subtract five for glossy glass.

How far from the wall should a ceiling spot be?

Roughly 0.6 times the height of the fitting above the centre of the artwork. With a 240 cm ceiling and a picture centred at 150 cm, that is about 55 cm out from the wall.

What CRI do I need for art lighting?

95 or above. This is the one application where 90 is not enough, because colour accuracy is the entire purpose.

How bright should art lighting be?

Three to five times the ambient light in the room. In a room at 100 lux, aim for 300 to 500 lux on the piece.

How do I light a whole gallery wall?

Do not light each piece. Wash the wall evenly with three or four wide beam fittings spaced along it, and treat it as wall lighting rather than art lighting.

Browse the wall lights collection for adjustable and picture style fittings.