Incandescent light bulbs also offer much greater illuminance than many other light sources, are relatively low cost and easy to install.
22.
Achieving an illuminance of 500 lux might be possible in a home kitchen with a single fluorescent light fixture with an output of.
23.
The corresponding illuminance is then E = LW = 4 * 10-10 lux, which agrees nicely with the first calculation.
24.
The lighting installation consists of 128 floodlights mounted on four masts 38m in height, and the average vertical illuminance is 1200 lx.
25.
The amount of daylight received in an internal space can be analyzed by measuring illuminance on a grid or undertaking a daylight factor calculation.
26.
This direct normal illuminance is related to the solar illuminance constant " E " sc, equal to ( see Sunlight ).
27.
This direct normal illuminance is related to the solar illuminance constant " E " sc, equal to ( see Sunlight ).
28.
For general photography, incident-light measurements are usually taken with a hemispherical sensor; the readings cannot be meaningfully related to illuminance.
29.
Total exposure of the film or sensor, the product of focal-plane illuminance times exposure time, is measured in lux seconds.
30.
A standard candle ( one candela ) a kilometre away would provide an illuminance of 1 microlux about the same as a magnitude 1 star.
