Corrected illuminance sequenceLive threshold and record order
Unit Converters
Illuminance Batch Conversion Calculator
Apply one documented calibration revision to an ordered illuminance survey, convert foot-candles or lux, calculate the mean and minimum-to-average uniformity, and retain every threshold exception.
ORDERED WORKPLANE SURVEY
Correct every reading without erasing the acquisition path
Use one unit and one calibration revision for an ordered lighting survey. The page converts each record to lux, reports threshold exceptions and minimum-to-average uniformity, and keeps the sequence visible.
Correction order: add the signed offset in the source unit, multiply by the calibration factor, then convert to lux. Negative corrected values invalidate the batch.
Corrected mean—
Corrected minimum—
Corrected maximum—
Minimum / mean uniformity—
Below threshold—
Uniform-equivalent incident flux—
LUMINOUS SURVEY RIBBON
See dark records, threshold crossings, and sequence drift
Bar height encodes corrected lux, color identifies threshold exceptions, and the connected line preserves survey order. The table provides the auditable raw-to-corrected ledger.
| Record | Raw | Corrected lux | Threshold state |
|---|
HOW TO USE
Process one coherent survey batch
- Enter readings in the same order as the survey path or acquisition log.
- Select lux or foot-candles for every record; split mixed-unit files.
- Copy the signed offset and multiplier from the applicable calibration revision.
- Enter a project review threshold in lux and the area represented by the mean only when that area assumption is useful.
- Investigate the exact exception rows and the sequence pattern before acting on the mean.
SURVEY FUNDAMENTALS
Six elements must stay traceable
CALCULATION METHOD
Correct in the certificate order, then summarize unrounded lux
Ei = (xi + b)mcEavg = ΣEi/nU0 = Emin/EavgΦeq = EavgAc is 1 for lux or 10.7639104167 lx/fc. No row is rounded before statistics or decisions.
CALIBRATION APPLICATION
The equation on the certificate controls the sign and order
This page applies offset before multiplier because that is the declared model. If your certificate defines indication correction, reference correction, or a different order, transform the inputs only after confirming the meaning. A convenient generic correction can reverse the sign and bias every row.
ORDER AS EVIDENCE
A dark edge and a warming source leave different patterns
Spatial order can reveal a perimeter deficit; chronological order can reveal warm-up or daylight drift. Sorting the batch would preserve min and max but destroy that evidence. Record the path convention so row 5 can be located again.
UNIFORMITY AND THRESHOLD
Average level cannot compensate for a dark point
Minimum-to-average uniformity describes distribution across the sampled records. A threshold count identifies specific rows below the entered planning level. Neither quantity proves compliance because the measurement grid, maintained conditions, and governing rule remain external.
DETAILED CALCULATION PROCESS
Default record reconciliation
| Symbol | Meaning | Default | Unit |
|---|---|---|---|
| xi | Raw readings | 420, 510, 560, 495, 380, 530 | lx |
| b | Offset | −2 | lx |
| m | Multiplier | 1.01 | dimensionless |
| L | Threshold | 450 | lx |
| A | Area | 24 | m² |
- For record 1, corrected = (420 − 2) × 1.01 = 422.18 lx.
- Repeat the same correction for every record without reordering.
- Compute the corrected mean from unrounded values.
- Locate the exact corrected minimum and maximum.
- Uniformity = corrected minimum ÷ corrected mean.
- Count corrected values below 450 lx.
- Uniform-equivalent incident flux = mean lux × 24 m².
- Reverse check each row as corrected/1.01 + 2 = raw.
RESULT INTERPRETATION
Use the ledger to explain the summary
A low mean indicates overall shortage only for the sampled population. A low uniformity identifies a dark record relative to the mean. Exception count must be read with location and threshold authority. Incident lumens are a uniform-equivalent area product, not fixture output.
EVIDENCE AND DATA LINEAGE
Retain enough information to return to every point
Keep point identifier, coordinates or path order, workplane height, meter, range, orientation, calibration revision, raw unit, timestamps, source and daylight state, ambient subtraction, fixture state, temperature, threshold source, and every unrounded corrected value.
LIMITS AND EXCLUSIONS
What the batch does not establish
- No coordinates are inferred from a one-dimensional list.
- No missing point is interpolated.
- No measurement uncertainty or guard band is applied.
- No spectral, cosine-response, or daylight correction is invented.
- No project or legal compliance conclusion is supplied.
WORKED DECISION CASES
Sequence changes the diagnosis
Perimeter survey
Low records recur at both ends of each row, pointing to edge distribution rather than random meter noise. The team reviews fixture layout and wall reflectance.
Warm-up run
Corrected values rise steadily in acquisition order. A simple mean hides source stabilization; the survey should be repeated after the stated warm-up time.
TECHNICAL GLOSSARY
Survey terms
- Indication
- Value shown by the instrument.
- Correction
- Value applied under a documented equation.
- Workplane
- Plane on which readings are taken.
- Uniformity
- Minimum-to-average ratio used here.
- Threshold
- Entered project review level.
- Lineage
- Record of how each value was obtained.
- Foot-candle
- Lumen per square foot.
- Incident flux
- Lux multiplied by represented area.
IMPORTANT NOTE
Do not mix calibration revisions inside one batch
Split the records when meter range, unit, correction equation, geometry, or source condition changes. One summary from incompatible rows is not defensible.
Frequently asked questions
Can I enter foot-candles?
Yes; every corrected value is then converted with the exact lx/fc factor.
Why is offset applied first?
That is the declared model; use your certificate’s equation.
Are threshold values inclusive?
The exception count includes only values strictly below the threshold.
Can I sort the list?
No, because order may encode space or time.
Does the area output equal fixture lumens?
No. It is a uniform-equivalent incident value.
Can a zero reading be valid?
Yes, but verify darkness, range, and instrument state.
Does uniformity prove compliance?
No. The governing grid and maintained conditions still apply.
What if corrected lux becomes negative?
The batch is rejected because negative illuminance is outside this model.
AUTHORITATIVE BASIS