ELCO KOTO · INDEPENDENT MEASUREMENTS

The color of dimming.

Two dim-to-warm modules, one fixed sensor. Explore how dimmer command changes illuminance, color temperature, and measured output variation.

HC · ELK11HCSD · Koto Sunset100 ascending settings each36 descending checks each

HC color range≈ 2,175–3,930 K

Measured adaptive lookup endpoints with a 5% command floor.

SD color range≈ 2,020–3,120 K

Matched fast-run estimates across the warm plateau and full output.

HC at half dimmer27% of full output

A 50% dimmer command gives about 150 lux versus 550 lux at 100%.

THE MEASURED CURVES

Follow the light.

Module Descending checks

● HC● SDSolid: ascending · dashed: descending

Color temperature K

Relative illuminance % of each module’s measured full output

Low-end illuminance lux · 1–20% command

Fast-mode observed modulation % · quantization-limited readings omitted

Move or touch any graph to read each curve at that dimmer command. Hollow markers indicate descending checks. Values between measured points are interpolated; keyboard users can focus a graph and use the arrow keys.

Inspect a dimmer setting

Values below are ascending observations. A command is not a guarantee of identical output after every dimming history.

Dimmer command 50%

DIMMING HISTORY

Direction changes the result.

At 17% command, HC measured about 12.5 lux ascending and 23.2 lux descending. Longer settling reduced some differences, but at 60% HC still differed by about 6% after 45 seconds.

Both directions remain visible in the graphs and downloads. These observations are an installation curve, not a universal specification for every fixture or dimmer.

FLICKER · READ WITH CARE

Variation is measured. Safety is not certified.

HC fast captures show a spectral candidate near 120 Hz. Observed min/max modulation was about 36% at full output and 40–42% at 50–60% command.

The sampling rate is only about 240–254 samples/second. Aliasing and phase coverage near its limit can understate modulation. Low-signal readings are quantization-limited; apparent zero or 100% modulation there is not a dependable severity estimate.

PstLM and SVM were not measured. HC visible flicker was not assessed. These graphs do not establish flicker-free operation.

METHOD & REPRODUCIBILITY

What the sensor actually saw.

Matched acquisition

HC: October 7, 2026. SD: October 6, 2026. Same fixed OPT4048 position and Lutron dimmer. A three-second settling wait, two color windows per setting, and a five-second fast waveform. Descent checks every 1% through 20%, then every 5% above.

Color & brightness

Color mode uses 25 ms conversions per channel and 30 individual samples per window. CCT is estimated from measured chromaticity using a nearest Planckian locus in CIE 1960 uv. No scaling to manufacturer ratings. Lux is illuminance at the sensor, not fixture lumens.

Limits & flags

Fast mode uses 600 μs conversions per channel. Modulation is 100 × (max−min)/(max+min), including sensor noise. The low-signal screen flags means below ten quantization steps. It is a measurement heuristic, not a flicker standard. Missing CCT is unavailable, never zero.

OPEN DATA

Take the measurements with you.

Public downloads contain aggregate numeric measurements and quality flags. They exclude household configuration, personal names, device identifiers, network endpoints, and credentials.

HC curve · CSV ↓SD curve · CSV ↓HC curve · JSON ↓SD curve · JSON ↓

Browse the measurement table

Module	Dimmer	Lux	Relative output	Estimated CCT	Fast modulation