“The early bird catches the worm”
A bird’s-eye view
Morning daylight helps set the body clock. That made me wonder whether timing matters for a red-light device too. Could the same dose do more first thing in the morning than in the evening?
In a UCL study, participants aged 34 to 70 with healthy eyes were given three minutes of deep red light (670 nm) to the eye between 8 and 9am. On average, their ability to pick out faint colour differences improved by about 17%, and the effect lasted around a week. A few months later, six of the 20 repeated the test between 12 and 1pm, and this time showed no improvement. The numbers are small, the study measured eyesight rather than muscles, and 1pm was the latest time tested.
Could mitochondria explain it?
Mitochondria make ATP, the molecule cells run on. In fruit flies, ATP levels were over 40% higher in the morning than at other times, and 670 nm light raised the flies’ respiration in the morning but not in the afternoon. A follow-up study found the same pattern for ATP: light raised it at 8am and 11am but not at other times, which suggests the boost only works when the flies’ own ATP production is already high. These were flies kept on a controlled light–dark schedule, not people.
What about muscles?
Here the research asks a different question: how long before exercise to use the light, rather than what time of day. In one placebo-controlled trial, the conclusion was that light could be used anywhere from 5 minutes to 6 hours before exercise, with the effect starting to fade at 24 hours.
Best time to use your panel
Until someone runs the morning-versus-evening test for muscles, here’s how I’d fit a panel into your day:
Use it close to your movement. In one trial, light used anywhere from 5 minutes to 6 hours before exercise still helped, but the benefit started to fade by 24 hours. A session before your workout, walk or match may help more than one on a rest day.
Before or after both work. In a trial with CrossFit athletes, light used before or after the workout improved performance and lowered markers of muscle damage. Pick whichever you’ll actually stick to.
Morning is a bonus. If your routine allows it, a morning session pairs well with getting daylight early. Just don’t let chasing the “perfect” time stop you using it at all.
Consistency beats timing. A regular session at roughly the same time of day is easier to keep up, and makes it easier to tell whether it’s helping.
Protect your eyes. The UCL eye study used a specially designed device at a very low dose. A panel is not that, so follow your device’s eye-safety guidance and don’t stare into it.
Best time to use your face mask
No study has compared morning and evening use of an LED face mask, so here’s the practical view:
Use it on bare, clean skin. One sleep expert pointed out that, because the light needs bare skin, that means either first thing, before makeup, or in the evening once it’s off. Both work. Choose the one that fits your routine.
Evening shouldn’t keep you up. Stanford sleep researcher Jamie Zeitzer found in his own work that even very bright red light did nothing to melatonin, though it had small effects on body-clock timing. If you’re a light sleeper, finish your session a little before bed.
Consistency beats timing. As with a panel, the same slot several times a week is what lets you judge whether it’s working.
Mind your eyes. A mask sits right over them. Use any eye protection supplied, follow the instructions, and check with your GP first if you have an eye condition or take medication that makes you sensitive to light.
What I’d take from it
Morning may matter, but nobody has tested it for muscle recovery or skin. What we can say is that using a panel close to your movement seems to count, and for both panels and masks, sticking to a routine counts more than the clock. That’s why we pair our devices with movement advice.
The experiment I’d like to see is simple. Give people the same dose after the same exercise, once in the morning and once in the evening, with a sham treatment at each time. Then see when strength and movement return.
Sources
Shinhmar et al., Scientific Reports 2021: doi.org/10.1038/s41598-021-02311-1
Weinrich et al., Scientific Reports 2019: doi.org/10.1038/s41598-019-48383-y
Shinhmar et al., Journal of Biophotonics 2022: doi.org/10.1002/jbio.202200093
Leal-Junior et al., BMC Sports Science, Medicine and Rehabilitation 2020: doi.org/10.1186/s13102-020-00214-8
Pinto et al., Oxidative Medicine and Cellular Longevity 2022 (CrossFit trial)
The Zoe Report, “When to use an LED face mask” (expert interviews)