Lighting
Foot-Candles Lux Calculator
The calculator turns the entered lighting values into illuminance and keeps the practical caveats on the page.
Run a Foot-Candles Lux check
Document whether illuminance and the other entries are measured, rated, assumed, or calculated.
Scope of the illuminance result
Foot-Candles Lux is most useful when the task is to convert illuminance from foot-candles to lux. It keeps the arithmetic visible and separates that case from nearby electrical questions.
Foot-Candles Lux changes with mounting height, beam shape, surface reflectance, and driver limits.
Source notes for Foot-Candles Lux
Collect Illuminance from the same operating case before reading illuminance.
- Illuminance
- Enter illuminance in fc. Default shown: 50 fc.
When your notes point to Daylight Factor, open it after saving this baseline so the two cases do not get mixed.
Interpreting Foot-Candles Lux
Read illuminance together with the input values, not as a standalone fact. The same number can imply different decisions under a different equipment rating or operating period.
Formula notes for Foot-Candles Lux
The Illuminance value and any supporting metrics belong to this same Foot-Candles Lux case, not to a nearby run with different inputs.
Boundaries for illuminance
The conversion changes units only; it does not account for meter calibration or spatial uniformity.
- Beam angle
- Fixture spacing
- Surface reflectance
A separate Lux Lumens run is cleaner when that result becomes the real design question.
When your notes point to Illumination Uniformity, open it after saving this baseline so the two cases do not get mixed.
Operating notes for Foot-Candles Lux
Foot-Candles Lux depends on lighting geometry. Mounting height, spacing, beam shape, and surface reflectance can change the usefulness of the answer.
When illuminance becomes an input to another worksheet, copy the value only after the units and source condition have been verified.
Records for illuminance
Keep fixture model, mounting height, distribution angle, and target plane with the Foot-Candles Lux result.
If a later Foot-Candles Lux run changes only illuminance, label it as sensitivity work. Several changed conditions deserve a new baseline.
Before saving illuminance
Can the default values be used as a recommendation?
No. The Foot-Candles Lux defaults only demonstrate the form. Replace them with measured or rated values for the actual lighting case.
Can this replace a design review?
No. Treat Foot-Candles Lux as arithmetic support; ratings, safety factors, code requirements, and manufacturer limits still need review.