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System health evolution chart with overall, UV, and lamp health trend lines

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How data loads

The Trend Analysis tab uses two-stage progressive loading to deliver an instant render even with a year of data: Stage 1 — Instant render (< 500 ms) Daily aggregated data is fetched from /api/telemetry/aggregated and /api/health/aggregated. This returns 30–365 rows (~50 KB) and the charts render immediately. Stage 2 — Background streaming Raw 3-minute records are streamed via /api/telemetry/chunked in 500-record chunks with a 100ms pause between each chunk. Charts progressively sharpen as raw data replaces the aggregated view. A progress indicator appears in the bottom-right corner during streaming. Streaming is skipped automatically if total records exceed 50,000. See Progressive Data Loading for the full technical explanation.

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Date range filter

Controls at the top-right of the tab set the start and end date for all charts. The default range is 30 days back from the most recent telemetry record. Changing the date range triggers a fresh data load.

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Summary stat row

StatDescription
Health TrendPercentage change in overall health score across the selected period, with a green (up) or red (down) trend icon
Avg EfficiencyMean lamp efficiency across all 16 lamps for the period
Avg UV IntensityMean UVR_INTENSITY in W/m² for the period
Data PointsNumber of telemetry records loaded (aggregated + raw)

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System Health Evolution chart

A line chart with three series over the selected date range:
SeriesColourField
Overall HealthPurpleoverall_score
UV HealthBluecomponents.uv_health
Lamp HealthGreencomponents.lamp_health
Y-axis: 0–100 score. X-axis: date. Useful for spotting correlations between UV intensity drops and lamp health degradation.

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UV Intensity Over Time chart

Full-width line chart showing UVR_INTENSITY in W/m² over the selected date range. X-axis labels are angled for readability. Use this chart to verify sustained compliance above the IMO threshold (252 W/m²) or USCG threshold (530 W/m²) over an extended period.

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Lamp Efficiency Heatmap

An 8 × 2 grid of 16 cells — one per lamp — showing the period-average efficiency for each lamp. Colour coding matches the Overview tab’s diamond array:
ColourEfficiency
Green≥ 90%
Yellow70–89%
Orange50–69%
Red< 50%
Use this to identify which specific lamps are underperforming over the chosen period without inspecting the Comparative Analysis tab.

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Lamp Efficiency & Power vs Runtime chart

Dual Y-axis chart showing lamp efficiency degradation (purple) and power compensation (blue) over runtime hours
A dual Y-axis chart showing how a selected lamp performs as it accumulates operating hours:
AxisSeriesDescription
Left Y-axisLamp Efficiency % (purple, solid)Efficiency decline over runtime
Right Y-axisLamp Power Output (blue, dashed)Power increase to compensate for degradation
X-axisCumulative runtime hours (10-hour buckets)
A lamp selector dropdown targets one of the 16 lamps. Switch between lamps to compare degradation rates. Data comes from /api/telemetry/runtime-analysis.

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Lamp Efficiency vs System UV Intensity chart

A companion dual Y-axis chart:
AxisSeriesDescription
Left Y-axisLamp Efficiency % (purple, solid)Selected lamp’s efficiency
Right Y-axisSystem UV Intensity W/m² (cyan, dashed)Aggregate system intensity
X-axisRuntime hours
This chart reveals an important operational insight: system UV intensity can remain stable even as individual lamp efficiency drops, because the LDC increases power to compensate. The gap between the two lines quantifies how hard the system is working to maintain compliance.

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Source

DataEndpoint
Stage 1 telemetry/api/telemetry/aggregated?interval=day
Stage 1 health/api/health/aggregated?interval=day
Stage 2 raw streaming/api/telemetry/chunked
Runtime charts/api/telemetry/runtime-analysis