The Light Fixture May Be Disappearing

I have spent enough time looking at reflected ceiling plans to know that lighting has always occupied a slightly strange place in design. We obsess over where the fixtures go, how they line up, what they wash, what they highlight, and whether someone is going to notice that one downlight is three inches off center. Pro tip: someone always notices.

But I have been watching a group of material innovations that raises a much bigger question about lighting. What happens when a light fixture goes away?

I do not mean that we are going to stop needing light, or that everyone is suddenly going to live by candlelight. I mean that the source of light is beginning to move into the materials and surfaces around us in several new ways. Individually, these are interesting science experiments, but taken together, these signals point toward something more consequential than a new category of glowing material. They suggest that the fixture may no longer be the only thing that can generate, shape, or visibly deliver light in the future.

One of the more interesting examples comes from recent work with perovskite emitters and metasurfaces, which shows that these surfaces can increasingly shape and direct the light they produce instead of just allowing the material to simply glow in every direction. That distinction matters more than it sounds. A glowing wall is an interesting social media moment. A wall that can throw useful light onto a work surface, illuminate a face without glare, or create a controlled pool of light starts doing something that we currently ask luminaires, lenses, reflectors, tracks, and mounting systems to do. And walls are only part of this.

Researchers have also demonstrated luminous fibers by printing phosphor directly onto flexible silica glass fibers. The resulting fibers maintained much of their light output through repeated bending and even after exposure to sweat. Follow that technology forward, and the curtain you specified for an exam room or someone's home could become a light source, so could an acoustic panel. A wall with an acoustic feature could begin to carry wayfinding information at night instead of adding another fixture or signage.

Wood is getting involved too, because apparently wood did not have enough jobs already. Researchers have created transparent wood with long-lasting phosphorescence that can absorb energy from light and continue emitting it after the original light source has been removed. Other work published this year has demonstrated 3D-printable phosphorescent wood-based materials, expanding the possible shapes and applications for these kinds of systems. It is still early research, and there are enormous gaps between producing a successful material in a laboratory and specifying 40,000 square feet of it in a space. But all of these point toward a question that I posed earlier about what happens when light doesn't need a fixture anymore. 

If that becomes a reality, some basic assumptions about architecture, planning, and design begin to change. Today, we generally choose the finish and the lighting system as separate things. They have separate manufacturers, separate specification sections, separate electrical requirements, separate maintenance cycles, and often separate consultants. In a future where the finish itself emits and directs light, those divisions become harder to maintain.

A designer might eventually specify a luminous surface using parameters that sound like a combination of a finish schedule and a lighting schedule. The questions we ask manufacturers would change with it. How much light does this textile provide after 10,000 hours? Can I replace one damaged section without replacing the entire wall? What happens when someone paints over it? That last one feels inevitable.

The ceiling plan also gets more interesting. If a ceiling tile can emit useful light across its entire face, the design problem becomes less about locating objects overhead and more about deciding which surfaces should be active, how much of them should be active, and what they should do at different times of day.

This could change the experience of light as well. A room illuminated by large luminous surfaces behaves differently from one illuminated by a collection of concentrated fixtures. Light could emerge from behind a headboard, through a textile, across a wall, along a handrail, or from the underside of a piece of furniture. Healthcare rooms could provide lower-glare nighttime illumination without adding another device to the wall. Hospitality environments could integrate lighting into soft goods and millwork. Wayfinding could remain visible after power is removed. A workplace might shift its light distribution as different surfaces become active throughout the day.

But there is another side to this that is probably more important than the visual possibilities. Fixtures are replaceable. We know how to unscrew them, open them, service drivers, swap components, and eventually take them down. Once lighting becomes part of a wall covering, textile, panel, or piece of millwork, we have to decide what happens when the light source fails before the material does, or the material fails before the light source does. The future of integrated lighting will depend as much on those serviceability questions as it does on what the materials can actually do.

To reassure some designers and manufacturers who may think this sounds like a huge threat, the light fixture will not vanish anytime soon. There are too many things fixtures do extremely well, and these emerging materials have a long way to go before they can meet the cost, longevity, output, code, serviceability, and performance requirements of mainstream architectural lighting. However, the direction is becoming worth watching. 

So the real question to consider today is this: If the material can do the work of the fixture, when will we still need the fixture at all?