If you already track your sleep, dial in your macros, and time your workouts around your circadian rhythm, you're ahead of most people. But there's a variable that even disciplined biohackers tend to overlook: light itself.
The Optimization Blind Spot
Most performance stacks focus on what goes into the body — supplements, food timing, training load. Far fewer people audit what their body is exposed to, even though light is one of the primary inputs your biology uses to regulate hormones, mitochondrial function, and recovery.
Researchers studying photobiomodulation — the use of specific red and near-infrared wavelengths — have linked this type of light exposure to markers associated with mitochondrial activity and cellular energy production. The mechanism under investigation involves cytochrome c oxidase, an enzyme in the mitochondria that appears to respond to light in the 630–850nm range.
What the Stack Looks Like
For people already optimizing sleep and training, light exposure functions as a layer that supports — rather than replaces — the fundamentals. A few principles researchers point to:
- Morning light exposure is associated with better-anchored cortisol rhythms, which in turn are linked to sleep quality and next-day energy.
- Red and near-infrared light in controlled studies has been associated with recovery-related markers in muscle tissue, though results vary by protocol, dose, and individual.
- Full-spectrum exposure, including UVA and UVB in appropriate doses, has been studied in connection with vitamin D synthesis and nitric oxide release — both of which are associated with cardiovascular and recovery-related outcomes.
This is the thinking behind devices like the Mitolux Solar X, which combines Red, NIR, UVA, and UVB to approximate a fuller solar-noon spectrum, versus the BTS2, which delivers Red, NIR, and UVB without UVA for people who want to avoid that specific wavelength range.
Where the Evidence Stands
It's worth being direct about this: photobiomodulation research is still developing, and individual response varies significantly based on protocol, dose, and baseline health. Athletes like Thomas DeLauer and biohackers like Tim Gray have spoken publicly about incorporating light exposure into their routines, but personal use cases aren't a substitute for controlled trials.
If you're already tracking sleep and training data, light exposure is a logical next variable to log — not because it's a shortcut, but because it's one of the few inputs most optimization stacks still ignore.
The Takeaway
Leveling up isn't about adding more. It's about closing the gaps in what you're already doing well. For most people optimizing performance, light is still an open gap.