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Owning a Light Lamp Didn’t Help Older Adults. Using It Early Did
In A Nutshell
- A study of 202 older adults in Amsterdam, Bologna, and Tartu found that using a light lamp before around 10:34 a.m. was linked to steadier, less fragmented daily activity compared to starting later.
- Simply owning a lamp made no measurable difference. Comparing the full lamp and no-lamp groups without factoring in timing showed no overall benefit.
- Only 52 of the 98 people given a lamp used it daily during follow-up, showing that adherence, not just access, shaped the results.
- Even before any lamp was introduced, people who naturally got more daylight during the day were more active and reported better sleep quality than those who got less.
An aging parent who spends the day in a dim living room, curtains half-drawn, lamps left off until evening, might be quietly working against their own health. A new study of 202 older adults across three European cities found that a cheap, store-bought light therapy lamp was linked to steadier daily activity patterns, but mainly among people who turned it on earlier in the morning. Wait too long, and the pattern faded.
Published in the Journal of Pineal Research, the study followed men and women between ages 63 and 92 living independently in Amsterdam, Bologna, and Tartu, Estonia. Scientists already knew from lab studies that bright light can help older adults. What they wanted to find out was whether people would actually use a light lamp the right way on their own, at home, without anyone watching over them, closing the gap between what works in a lab and what works in real life.
Timing turned out to matter more than simply owning a lamp. People who turned on their lamp before around 10:34 a.m., the midpoint of when participants in this study started their sessions, had less fragmented, more consolidated activity throughout the day than those who started later, a pattern that held up even after researchers accounted for whether someone was naturally a morning or evening person. People who also switched their lamp off earlier in the evening, before about 5:45 p.m., showed that same steadiness in their rest patterns.
Aging Eyes Let in Far Less Blue Light Than Younger Ones
As people pass age 50, their eyes change in ways that quietly cut down how much light reaches the cells that help set the body’s internal clock. The lens clouds a bit, the pupil shrinks, and fewer of the light-detecting cells that support alertness and sleep timing stay active. The eye’s ability to let in blue light, the type most important for feeling awake and keeping the body’s rhythm on track, drops sharply between childhood and old age. Add in modern apartment living, where people often spend most daylight hours indoors, and older adults can end up starved for light even when the sun is shining outside.
Earlier research had already shown that carefully timed light exposure in controlled settings can help older adults sleep better and feel more alert. What hadn’t been tested was whether ordinary people, left on their own, would use a light lamp in a way that actually delivers those benefits at home.
Just Over Half of Lamp Users Stuck With Daily Use
Researchers recruited 202 people from neighborhoods in Amsterdam, Bologna, and Tartu, areas chosen partly because residents there had more nighttime electric light exposure and lower average incomes, places where light-related health problems might hit hardest. Participants wore wrist activity trackers and small light sensors for two weeks to establish a baseline, then were split randomly into two groups. Ninety-eight people received a light therapy lamp to place in whatever room they spent the most time in, with instructions to turn it on within an hour of waking, keep it running for at least two hours during the day, and turn it off at least four hours before bedtime. The other 93 participants kept their normal routines with no lamp. After twelve weeks, everyone repeated the two-week tracking period so researchers could compare before-and-after results.
Only 52 of the 98 people given a lamp reported using it daily during follow-up, a reminder that even a simple change doesn’t guarantee people will stick with it. Looking at everyone in the lamp group versus everyone in the no-lamp group, regardless of when or how often they used it, researchers found no overall difference between the two. The value of the lamp wasn’t really about having it. It was about when people chose to use it.
More Natural Daylight Meant Better Sleep, Even Before Any Lamp Was Used
Even before anyone received a lamp, the baseline data told an interesting story. People who naturally spent more time in bright daylight were more active and reported better sleep quality than those who got less daylight exposure, independent of whether they later used a lamp at all. Participants with conditions like high blood pressure, diabetes, obesity, or heart disease also had measurably lower daily light exposure than those without those conditions.
Season shaped how people used their lamps, too. Winter’s shorter days led people to start their lamp sessions earlier and run them more than twice as long as they did in summer, adjusting their light-seeking habits almost instinctively to make up for what nature wasn’t providing. People who naturally got less daylight outdoors also logged roughly two additional hours of lamp use per day compared to people who already got plenty of sunlight.
Owning a Lamp Didn’t Help, Using It Early Did
This study points to a simple idea, tested in a complicated way: a light lamp is only as useful as the schedule behind it. Nearly half the people given a lamp didn’t use it daily, and simply being handed one made no measurable difference. For families considering light therapy for an aging relative, the lesson goes beyond buying the lamp. It’s making sure it gets switched on early.
Disclaimer: This article summarizes findings from a single peer-reviewed study and is intended for general information only. It is not medical advice. Anyone considering light therapy, especially alongside existing health conditions or medications, should talk with a doctor first.
Paper Notes
Limitations
The researchers noted that their sample likely skewed toward more active and educated older adults than the general population, which limits how broadly the results apply. The group was also predominantly female (about 74% of participants), and the study did not collect information on menopause status or related symptoms that could affect sleep and circadian patterns in women. Because objective light readings were only collected during two two-week windows (at the start and end of the study) rather than continuously across the full twelve weeks, researchers could not fully separate short-term, day-to-day effects of light from longer-term ones. The study also allowed lamp placement and usage to vary naturally at each participant’s discretion, which reflects real-world conditions but also introduced variability that may have diluted some effects. Participant numbers were uneven across the three cities as well, and the light supplementation schedule was not personalized to each individual’s natural sleep-wake timing. It’s also worth noting that people who chose to switch on their lamps earlier may have differed from later users in other ways the researchers could not fully account for, even after adjusting for factors like chronotype.
Funding and Disclosures
The study was funded by the European Commission under its Horizon 2020 Research and Innovation Programme through the ENLIGHTENme project (Grant Agreement No. 945238), along with support from the University of Surrey Doctoral College. One author disclosed being a co-inventor on issued patents related to light technology, and another author directs the company that performed melatonin analysis for the study. The remaining authors reported no conflicts of interest.
Publication Details
The paper, titled “ENLIGHTENme: Translating the Benefits of Self-Administered Daytime Light Supplementation to Older Adults in the Real World,” was authored by Débora B. Constantino, Flavia Baccari, Leonardo Caporali, Valerio Carelli, Giulia Amore, Marijke Gordijn, Toomas Haller, Chiara La Morgia, Anne Landvreugd, Marina Marinelli, David McDaid, Monika Nõmm, Francesco Nonino, Martina Romagnoli, Martino Schettino, Corrado Zenesini, Meike Bartels, Debra J. Skene, and Daan R. van der Veen. It was published in the Journal of Pineal Research (2026; 78:e70174). DOI: 10.1111/jpi.70174.
