Illuminance | The Units and Constants Handbook at KnowledgeDoor

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	Illuminance
	Illuminance

Characteristic		footcandle		Notes
Characteristic		footcandle		Notes
Symbol	fc
Other Name	ft-C
Metric (SI) Equivalent	1.0763910417 deka luxes			This equivalent and the others below are calculated from exact values.
Other Metric (SI) Equivalents with More Basic Units	1.0763910417 deka lumens / meter2
Other Metric (SI) Equivalents with More Basic Units	10.763910417 steradian candelas / meter2			Even though the steradian is a dimensionless derived unit and could be dropped, it is shown in this equivalent for clarity
Metric (SI) Dimensions	length-2 × luminous-intensity × solid-angle			Even though solid-angle is not an official metric (SI) dimension and could be dropped, it is shown in the dimensions for clarity.
Description in Terms of Other Units and Constants	lumen / foot2

Characteristic		lux		Notes
Characteristic		lux		Notes
Symbol	lx
Metric (SI) Equivalent	lux is a metric unit (in fact, it is a derived SI unit)
Other Metric (SI) Equivalents with More Basic Units	10 deci lumens / meter2
Other Metric (SI) Equivalents with More Basic Units	1 steradian candela / meter2			Even though the steradian is a dimensionless derived unit and could be dropped, it is shown in this equivalent for clarity
Metric (SI) Dimensions	length-2 × luminous-intensity × solid-angle			Even though solid-angle is not an official metric (SI) dimension and could be dropped, it is shown in the dimensions for clarity.

Characteristic		nox		Notes
Characteristic		nox		Notes
Metric (SI) Equivalent	1 milli lux			This equivalent and the others below are exact.
Other Metric (SI) Equivalents with More Basic Units	1 milli lumen / meter2
Other Metric (SI) Equivalents with More Basic Units	0.001 steradian candelas / meter2			Even though the steradian is a dimensionless derived unit and could be dropped, it is shown in this equivalent for clarity
Metric (SI) Dimensions	length-2 × luminous-intensity × solid-angle			Even though solid-angle is not an official metric (SI) dimension and could be dropped, it is shown in the dimensions for clarity.

Characteristic		phot		Notes
Characteristic		phot		Notes
Symbol	ph
Metric (SI) Equivalent	10000 luxes			This equivalent and the others below are exact.
Other Metric (SI) Equivalents with More Basic Units	10000 lumens / meter2
Other Metric (SI) Equivalents with More Basic Units	10000 steradian candelas / meter2			Even though the steradian is a dimensionless derived unit and could be dropped, it is shown in this equivalent for clarity
Metric (SI) Dimensions	length-2 × luminous-intensity × solid-angle			Even though solid-angle is not an official metric (SI) dimension and could be dropped, it is shown in the dimensions for clarity.

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