Picture and display lighting without wiring

Almost every other page on this site starts with a lumen target. This one does not, because lighting a picture is not about quantity. A framed work is a small area at close range, and the amount of light needed is modest.

What decides whether it looks right is color rendering. The purpose of the light is to show the colors in the work, and a CRI 80 source renders deep reds so poorly that it materially changes what you see - skin tones go sallow, reds go brown, and a painting looks flatter than it is.

So the picks here are high-CRI light sources with published figures. The Waveform 95 CRI BR30 and YUJILEDS CRI-MAX BR30 both publish R9 - the deep-red figure that the headline CRI number leaves out - which is exactly the number that matters when the subject is a picture. The reasoning is in high-CRI LED bulbs.

The second thing that decides the result is where the light comes from. There is a narrow band that works and it is easy to miss in both directions.

With glass or acrylic glazing the angle stops being cosmetic. Light arriving straight at the piece reflects the source back at whoever is standing in front of it, so the work becomes a mirror. Around 30 degrees from vertical throws that reflection down toward the floor instead.

A practical test before committing to a mount: hold a phone torch where you intend to put the light, stand where people actually stand, and look. If you can see the torch in the glazing, move it. It costs nothing and it is the difference between a lit picture and a bright rectangle.

1. A rechargeable picture light on the frame or the wall above it. This is the one category on the site where battery power is unequivocally right: the output needed is low, the light is on for the time you are in the room, and the wall above a picture almost never has an outlet. Look for a magnetic mount on an adhesive plate so it comes down to charge.
2. A plug-in wall fixture aimed at the piece, which gives you a standard socket and therefore a proper high-CRI bulb. More light and better color than any battery unit, at the cost of a cord - see plug-in wall sconces.
3. A COB strip in a channel above a display shelf or inside a niche. A continuous COB strip at CRI 90+ gives an even line with no dotting, which matters when the strip itself may be visible. Use an aluminum channel on painted surfaces rather than sticking the strip directly.

Whichever route, keep the color temperature consistent with the room around it. A 4000K spotlight on a picture in a 2700K room makes the artwork look like it belongs to a different building - the chart is in the color temperature guide.