getbased includes eight measurement utilities for characterizing your light environment. All processing runs in your browser — camera frames and sensor data are never sent to a server. Access all tools from the Light & Sun page under the Light tools section.Documentation Index
Fetch the complete documentation index at: https://docs.getbased.health/llms.txt
Use this file to discover all available pages before exploring further.
Tools at a glance
| Tool | What it measures | Best used for |
|---|---|---|
| Lux Meter | Ambient brightness in lux | Setting up a workspace, comparing rooms, verifying outdoor exposure levels |
| Flicker Detector | PWM banding at 240 fps + risk score | Identifying problem bulbs and screens causing eye strain |
| CCT Meter | Color temperature in Kelvin + solar coherence check | Catching evening blue-light contamination from indoor lights |
| Spectrum Classifier | 5-category light source identification | Auto-filling room type in the Light Environment survey |
| Glass Transmission | Inside-vs-outside brightness ratio + UV transmission estimate | Auditing how much light your windows actually block |
| Sleep Darkness | Long-exposure lux reading at pillow level | Checking whether your bedroom is dark enough for full melatonin |
| Sunrise Logger | One-tap sunrise / sunset session entry | Capturing routine golden-hour outdoor light |
| Eye-Level Audit | Room-by-room lux walkthrough | Populating your full Light Environment in a single 10-minute pass |
Tool 1 — Lux Meter
Measures ambient brightness in lux. Uses your phone’s AmbientLightSensor API when available (Chrome on Android), with a camera-based estimate as a fallback on other browsers. Color-coded zones help you interpret readings:| Lux range | Zone |
|---|---|
| 0–10 | Darkness (full night) |
| 10–100 | Low indoor (dim room) |
| 100–500 | Office (well-lit computer work) |
| 500–1,000 | Bright indoor |
| 1,000–10,000 | Overcast outdoor |
| 10,000–100,000 | Outdoor daylight |
| 100,000+ | Direct sun |
Tool 2 — Flicker Detector
Aim your camera at a light source. The live preview shows banding patterns if the light is flickering. Flicker comes from pulse-width modulation (PWM) dimming, which is common in LEDs and fluorescent lights. After roughly five seconds of capture, you get:- A score from 0 (flicker-free) to 3 (heavy flicker)
- An estimated PWM frequency in Hz
- A plain-English label: Flicker-free / Mild, likely OK for most / Visible flicker — eye-strain risk / Heavy flicker — replace this light
Tool 3 — CCT Meter
Aim at a white wall, a sheet of paper, or a printable grey card. The tool gives you a live color temperature estimate in Kelvin — from 1,800 K (candlelight) up to 6,500 K and above (overcast sky / daylight). Estimates use RGB white-balance ratios from the camera. The solar coherence indicator compares your indoor CCT to the approximate solar color temperature for the current hour:- Matches solar time — within 800 K of the expected solar CCT
- Slight mismatch — noticeable gap but not severe
- Mismatch — your indoor light is working against the sun’s signal (for example, a 4,000 K cool LED at 9 pm when the sun set hours ago)
Tool 4 — Spectrum Classifier
Single-tap classification. The tool uses your camera’s RGB ratio and flicker variance signature to categorize the light source into one of five types:- Fluorescent / CFL — high flicker variance with a green color spike
- Incandescent / halogen — red-rich, low blue
- Cool LED (4,000 K+) — blue-rich, near-flicker-free
- Warm LED (2,700–3,000 K) — slight red lift, near-flicker-free
- Daylight or full-spectrum — balanced RGB
Tool 5 — Glass Transmission
Measures how much light your window actually blocks. The flow has two steps:
The app computes the transmission ratio between the two readings. Most modern Low-E coated glass blocks 80–90% of UV and 30–50% of visible light. Tinted automotive glass typically blocks more.
This gives you a real number for how much your windows reduce the cellular repair channel — and lets the AI factor your specific glass into your indoor exposure estimates.
Tool 6 — Sleep Darkness
Place your phone face-up at the position where your eyes will be when you sleep. Set the room conditions to match how you actually sleep. Tap Start — the tool runs a 30-second long-exposure read.| Lux reading | Assessment |
|---|---|
| < 0.3 lux | Excellent — true darkness |
| 0.3–1 lux | Good — minor light leak, melatonin mostly preserved |
| 1–5 lux | Light leak detected — ~20–30% melatonin attenuation |
| > 5 lux | Bright — melatonin amplitude significantly suppressed |
Tool 7 — Sunrise Logger
One-tap session entry for sunrise and sunset windows. The tool auto-labels the time window (Sunrise / Sunset / Golden hour) based on the current hour and pre-fills a typical exposure: face and hands, with direct eye exposure, for roughly 15 minutes. This is the most circadian-effective outdoor light most people get on a typical day, and it’s the easiest to consistently log.Tool 8 — Eye-Level Audit
A 10-minute room-by-room camera walkthrough that populates your entire Light Environment in one pass. The camera streams at 4 fps and detects when you’ve paused in a room (5 seconds of stillness), capturing a lux reading at eye level. After your walk:- Review the list of pauses on the after-walk panel
- Label each pause with the room name
- Tap Done
Tool 8 captures lux only, not CCT or full spectrum. The goal is fast full-home coverage. For richer data on a specific room — flicker, color temperature, sleep darkness — open the dedicated tool from that room’s card after the walkthrough.