A crescent moon sits on a lab bench, glowing electric blue — and it’s alive. It’s made from marine algae, the same single-celled organisms that flash briefly when ocean waves roll over them or a boat cuts through the water at night. That fleeting glimmer has fascinated scientists for decades. The problem: it vanishes in seconds.
Now, for the first time, researchers say they’ve found a way to make that light last.
A flash of blue that disappears too fast
Pyrocystis lunula is a single-celled marine alga with an unusual talent. When disturbed by a wave or a passing hull, it emits a brief, brilliant blue flash. The mechanism is a well-understood biochemical reaction: an enzyme called luciferase accelerates a reaction between oxygen and a molecule called luciferin, releasing most of the resulting energy as visible light. The name luciferase comes from the Latin lucifer, meaning “light-bearing.”
Bioluminescence is far from rare. As many as 90 percent of deep-sea creatures may be capable of producing their own light, and the trait appears across animals, plants, and fungi alike. Even so, it’s rarely been put to practical human use — the light tends to be brief, dim, or nearly impossible to control once an organism is removed from its natural environment.
The team at the University of Colorado Boulder ran into that problem almost immediately. Their first instinct was to replicate the mechanical trigger that causes P. lunula to glow in the wild — the physical disturbance of a wave or a passing hull. They tried squishing the algae to mimic that pressure. “They weren’t really responding to that,” bioengineer Giulia Brachi told the Guardian. It was a dead end, and the researchers needed a different approach entirely.
The chemical key that kept the light on
With mechanical stimulation ruled out, the team turned to chemistry. Prior research had suggested that P. lunula‘s bioluminescence could be triggered by exposure to certain chemical compounds, so the researchers began testing solutions of varying acidity and alkalinity on the algae to see what happened.
The results were telling. A basic solution — roughly as mild as liquid soap — did produce a glow, but it was diffuse and short-lived. The researchers interpreted that pattern as a sign of cellular stress rather than a controlled response. The acidic solution told a different story: at roughly the acidity of tomato juice, it triggered a concentrated, sustained glow lasting up to 25 minutes.
That duration matters. “It was a very exciting moment when we found the right chemical stimulant that allowed the light to stay on for a long time,” Brachi said in a statement. “This is the first time we have figured out how to sustain luminescence.” The emphasis on “first time” is deliberate — this wasn’t an incremental improvement on previous work. No one had managed to hold the light on this long before.
Printing living light into shapes
Sustaining the glow was one breakthrough. Shaping it was the next. The researchers embedded P. lunula in a water-based gel that could be fed through a 3D printer, then printed the living material into distinct, recognizable forms — a crescent moon, a grid, and the University of Colorado Boulder’s logo.
The structures weren’t simply decorative proofs of concept. Algae remained alive inside the printed gel for four weeks — a meaningful result given how difficult it can be to keep living organisms functional within fabricated material structures. Acid-treated samples retained 75 percent of their luminescent capacity when tested at the end of the study period, suggesting the cells weren’t merely surviving but holding onto their core biological function. The study was published in Science Advances on May 6.
The crescent moon on that lab bench isn’t a metaphor. It’s a working prototype of something genuinely new: a living, light-emitting object that holds its shape and keeps glowing.
Where living lamps could go next
The immediate applications the researchers envision are modest but tangible. Glowsticks and luminescent wearables — bracelets, for instance — are among the near-term possibilities Srubar described to the Guardian. Further out, the technology could provide battery-free lighting for autonomous robots operating where conventional power sources are impractical, including deep-sea missions and space exploration.
There’s also an environmental sensing angle worth watching. If P. lunula turns out to respond to a broader range of chemicals beyond acids and bases, it could potentially serve as a living toxin monitor — a biological sensor embedded in water systems that signals contamination through light rather than requiring external instruments.
Perhaps the most counterintuitive dimension of the work is its relationship to carbon. Because P. lunula is photosynthetic, it removes dissolved carbon dioxide from its surroundings to produce food, which inverts the usual equation. “We’re storing carbon while we’re producing light,” Srubar said, “whereas conventionally, we emit carbon to light up spaces.” His broader vision: “a world in which we don’t use electricity but rather use biology to produce light.”
Real-world hurdles still ahead
Not everyone is ready to call this a solved problem. Chris Howe, a biochemist at the University of Cambridge who wasn’t involved in the research, offered a grounded assessment. “Moving it from what works under controlled conditions in the lab to what works in the real world will be a challenge,” he told the Guardian, “but this is a really interesting first step.”
That framing — interesting first step — is the honest one. Brightness levels, longevity outside carefully managed lab conditions, and the feasibility of scaling production all remain open questions. The 25-minute glow is a genuine scientific first, but a lamp you can buy at a store requires far more than a proof of concept.
What the CU Boulder team has demonstrated is that the underlying biology can be coaxed, shaped, and sustained in ways that weren’t previously possible. Whether P. lunula eventually lights a room, a robot, or a stretch of ocean pipeline, the field of living light just got its most concrete result yet.