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Sun isn’t just vitamin D. Different wavelengths do different things — set your body clock, support circulation, charge your mitochondria, regulate mood hormones. The Light lens tracks your sun exposure across six biological channels and lets you correlate them with your labs and wearable data over time.

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What sun sessions tracks

Each session is scored across six channels based on how your accumulated dose compares to a literature-derived daily target. Scores run from none → low → moderate → good → strong.
The app deliberately doesn’t surface raw dose numbers. The AI sees them, but your dashboard shows qualitative scores — which is all you need to make decisions.

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How to log a session

The primary flow is a one-tap quick log.
1

Start a session

Tap Log a sun session in the Light lens or the Light Today dashboard widget. The app pulls the current UV index and ozone for your location, reconstructs the spectrum at your sun angle, and starts accruing dose.
2

Stop when you're done

When you come back inside, tap the same button — now labelled Stop session — N min. That’s the whole flow.
Quick-log defaults carry over from your last session. If you want to adjust body regions, eyewear, or SPF before you start, open the full session picker from the Light lens.

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First-time setup

The first time you open the Light lens, a short setup card asks a few questions to calibrate your personal scores:
  • Skin type (Fitzpatrick I–VI) — used to scale your personal sunburn threshold
  • Home lighting — LED cool, LED warm, fluorescent, incandescent, or mixed
  • Eyewear outside — none, sunglasses, clear glasses, or contacts with UV block
  • Location precision — your country is the default; tap Use precise location for sharper UV math (stored on this device only, never synced)
  • Photosensitizing medication — if you take tetracyclines, isotretinoin, thiazides, NSAIDs, amiodarone, St. John’s Wort, or similar drugs, your effective burn threshold drops roughly 2.5×
An optional 10-question light-burden audit captures how indoor- or artificial-light-dominated your typical day is. The AI uses this baseline when interpreting your channel scores (“your low body-clock channel makes sense given your light-burden score”).

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Live session controls

While a session is running, a Live card pins to the top of the Light lens with running dose totals per channel. You can interact mid-session: For targeted protocols (face only, abdomen only, back only), the detailed session view includes a per-region anatomical silhouette picker covering 16 regions split across front and back.

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MED calculation and burn alerts

The Light lens and Light Today dashboard widget show your burn risk in plain English throughout the day:
  • Safe — under 30% of your personal daily sunburn threshold
  • Moderate — 30–70%
  • Approaching — 70–100% — time to cover up if you go back outside
  • Reached — over 100% — sunburn risk, no more direct sun today
These thresholds are computed from each session’s CIE-erythemal-weighted dose compared to your Fitzpatrick skin type’s minimal erythemal dose (MED). The burn model uses a 1.5× conservative cap and warns you explicitly before you reach it.
If you’ve checked the photosensitizing medication box in your setup, your effective burn threshold is reduced by approximately 2.5×. Alerts will fire sooner.

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Atmosphere data

getbased uses real atmospheric data to reconstruct the solar spectrum at your location and elevation. You can choose your Sun data source directly in the Light lens:
KNMI-validated total column ozone, aerosol optical depth, and particulate data from the Copernicus Atmosphere Monitoring Service (CAMS), merged with Open-Meteo for cloud cover, temperature, and a baseline UV index. Best accuracy when you need precise channel estimates.
Source confidence is computed per request — snapshot age, cloud cover, sun elevation, UV index band, and a stale flag all discount the displayed percentage. A reading at low sun under heavy cloud honestly drops to around 40%, even from CAMS. No false precision.
Latitude and longitude default to your country from your profile. No automatic geolocation prompt fires at session start. The optional precise-location upgrade is stored on this device only and never synced.

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Photobiology device library

Got a red-light therapy panel, a SAD lamp, a UVB lamp, or a full-spectrum bulb? Add it from the Light Devices section in the Light lens. getbased ships a 19-preset library covering devices from Chroma, EMR-Tek, and Mitochondriak. For other brands — Joovv, Mito Red, Sperti, Verilux, Lumie, and others — paste the spec sheet into the custom-device dialog and the AI extractor maps wavelength and irradiance into the same schema. Device sessions feed the same six per-channel dose totals as outdoor sun. If you use a photobiomodulation (PBM) panel but spend little time outdoors, the Cellular repair channel will still light up — and the AI will see your device sessions in context. The correlation engine also includes the two PBM-specific channels (660 nm red / 810–850 nm NIR) so device-heavy users get device × biomarker correlations surfaced over time.

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AI sun analysis

After each session, getbased can generate a verdict on your sun exposure. The AI evaluates your channel mix, your device use, your skin type, your photosensitive-medication flag, and your rolling weekly totals — and returns a green / yellow / red assessment with a short explanation. Verdicts fire automatically when you stop a session. You can also request a fresh analysis manually from the session detail card.

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Where sun data appears in AI context

Sun sessions, light-device sessions, and indoor light environment data belong to the Light & Sun source. They appear in in-app AI chat and light-related score context when Insight → Manage → Context → Data sources → Light & Sun context is on. With that source enabled, the Light summary can cover:
  • Your active channel deficits and surpluses
  • Your configured devices and recent device sessions
  • Your week’s per-channel exposure (sun and devices combined)
  • Your skin’s daily sunburn budget
Once you have four or more weeks of overlapping sessions and lab results, channel-by-biomarker correlations join the standard context while the Light & Sun source is enabled — so the AI can reason about things like the relationship between your weekly UVB dose and your 25-OH vitamin D trend.
Sun and wearable data sit side-by-side in dashboard widgets and, when both sources are enabled, in AI context. That lets the AI reason about things like “low HRV on days after high-UV sessions” without you having to connect the dots yourself.
If your Genome data includes GC rs2282679, CYP2R1 rs10741657, NADSYN1/DHCR7 rs12785878, or the CYP24A1-region rs6013897, getbased can apply conservative context weights to the modeled vitamin D serum-response estimate. These variants are associated with circulating 25-OH vitamin D; the adjustment is not a direct measurement of skin synthesis or a clinical dose calculation. VDR and CYP27B1 catalog findings remain available as interpretation context but do not change the numeric estimate.