illuminance

IPA: ɪɫˈumʌnʌns

(physics) The luminous flux incident on unit area of a surface; measured in lux or lumens.

Examples of "illuminance" in Sentences

With the illuminance given the light source can be found.
Illumination or illuminance in various systems of units lx ph fc
In average it will be 1 - 3% of the general lightings illuminance.
Its mean illuminance will be less than that of the general lighting.
Initially, the oil was used as a lubricant for the railroad industry and as an illuminance.
The illuminance of special lighting may be up to 100% of the general lightings illuminance.
A consequence of the putting into practice of so great an illuminance is that the luminance in the range of vision can no more be an optimal one, if no coloured surfaces are used in the working room.
The illuminance required in a room or at a working place must be realized - according to the respective visual task - by a suitable number and type of lamps and lighting fittings and their arrangement.
Since the rated luminous flux is greater than the calculated one, it derives for the illuminance in point P: for high-pressure mercury vapour illumination 128 lx and for high-pressure sodium vapour illumination 139 lx
It is also possible to proceed this way: Calculation from a given arrangement of illuminators and the given luminous flux per illuminator taking into consideration the light distribution of the illuminators the illuminance, for instance at a certain point of the working area.