In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates...

The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per...

daylight received in an internal space can be analyzed by measuring illuminance on a grid or undertaking a daylight factor calculation. Computer programs...

this area, illuminance at point  r  on  d A ,  E v ( r ) = ∑ i | a ^ ⋅ ( r − r i ) | | r − r i | 3 I i . {\displaystyle {\text{illuminance at point }}\mathbf...

varies logarithmically, it is helpful to have an appreciation of both illuminance and luminance by orders of magnitude. To help compare different orders...

square metre with an illuminance of 1,000 lux. The same 1,000 lumens, spread out over ten square metres, produces a dimmer illuminance of only 100 lux. Mathematically...

The solar constant (GSC) measures the amount of energy received by a given area one astronomical unit away from the Sun. More specifically, it is a flux...

seconds) E is the image-plane illuminance (lux or lumens/m²) t is the exposure time ("shutter speed") (seconds) The illuminance E is controlled by the f-number...

luminous power is concentrated into a smaller area, meaning that the illuminance is higher at the image. The light at the image plane, however, fills...

The Kruithof curve describes a region of illuminance levels and color temperatures that are often viewed as comfortable or pleasing to an observer. The...