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GET /v1/illuminance

Illuminance from a point source

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/photometry-api

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Code snippets

curl "https://api.oanor.com/photometry-api/v1/illuminance" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/photometry-api/v1/illuminance", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/photometry-api/v1/illuminance");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/photometry-api/v1/illuminance",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Point-source illuminance E = I·cos(θ)/d² (lux), with θ the angle of incidence from the surface normal. A 1000 cd source at 2 m gives 250 lux head-on.",
        "inputs": {
            "distance": 2,
            "intensity": 1000,
            "incidence_angle": 0
        },
        "illuminance_lux": 250
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:24.198Z",
        "request_id": "83a6b870-8783-435d-8023-fbeb46094d57"
    },
    "status": "ok",
    "message": "Illuminance",
    "success": true
}