Health Score Calculation

How the system’s 0–100 composite health score is derived from four component sub-scores.

What the health score is

The system health score is a 0–100 composite metric stored in the bwts_iot_health_scores table. It represents the overall condition of the BWTS at each telemetry timestamp. The score is displayed as the arc gauge on the Overview tab’s top-right corner and as a trend line in the Trend Analysis tab.

The score is pre-computed by the data pipeline — not calculated by the dashboard itself. The dashboard reads and displays the stored values.

The four component scores

Each component is independently scored 0–100 and contributes to the overall score:

Component	Field	What it measures
UV Health	uv_health	How closely UVR_INTENSITY matches the target operating point (650 W/m²)
Lamp Health	lamp_health	Aggregate efficiency of all 16 lamps relative to their rated output
Power Efficiency	power_efficiency	Ratio of actual to rated power consumption across the lamp array
Thermal Health	thermal_health	LDC temperature management — LDC_AIR_TEMP vs safe operating range, fan status

The Trend Analysis tab exposes uv_health and lamp_health as individual series in the health evolution chart alongside overall_score.

Risk level thresholds

Overall Score	Risk Level	Gauge colour	Interpretation
80–100	LOW	Green	All systems nominal
60–79	MEDIUM	Blue	Minor degradation — monitor closely
40–59	HIGH	Orange	Maintenance recommended soon
0–39	CRITICAL	Red	Immediate action required

The risk_level field in the database stores the string value (LOW, MEDIUM, HIGH, CRITICAL) corresponding to these bands.

Where health scores appear in the dashboard

Location	What is shown
Overview tab — top-right arc gauge	overall_score from the latest health record
Trend Analysis — health evolution chart	overall_score, uv_health, lamp_health over the selected date range
/api/health endpoint	Array of health records (latest first)
/api/health/aggregated endpoint	Time-bucketed health scores for charting

API response shape

{
  "timestamp": "2026-04-30T00:00:00Z",
  "overall_score": 82,
  "risk_level": "LOW",
  "components": {
    "uv_health": 88,
    "lamp_health": 79,
    "power_efficiency": 84,
    "thermal_health": 91
  }
}

References

• UV Thresholds — how UV intensity maps to compliance and health
• RUL Algorithm — how lamp predictions relate to lamp_health
• lib/constants.ts — THRESHOLDS.HEALTH_SCORE contains the 80/60/40 breakpoints