AYDINLATMA VE AYDINLATMA İLGİLİ TEMEL BİLGİLER

Lighting includes both artificial light sources such as lamps and natural illumination of interiors from daylight. Lighting represents a major component of energy consumption, accounting for a significant part of all energy consumed worldwide. Artificial lighting is provided today by electric lights, but previously by gas lighting , candles or oil lamps . Proper lighting can enhance task performance or aesthetics, while there can be energy wastage and adverse health effects of lighting. Indoor lighting is a form of fixture or furnishing , and a key part of interior design. Lighting can also be an intrinsic component of landscaping.

Daylight or the light of day is the combination of all direct and indirect sunlight outdoors during the daytime (and perhaps twilight). This includes direct sunlight , diffuse sky radiation, and (often) both of these reflected from the Earth and terrestrial objects. Daytime is the period of time each day when daylight occurs. While perceived moonlight is in fact light from the sun reflected towards the Earth, and is hence to be considered "indirect sunlight", it is not considered daylight as it occurs outside of the hours that one would consider "daytime".

 

In photometry , illuminance is the total luminous flux incident on a surface, per unit area . It is a measure of the intensity of the incident light , wavelength-weighted by the luminosity function to correlate with human brightness perception. Similarly, luminous emittance is the luminous flux per unit area emitted from a surface. Luminous emittance is also known as luminous exitance.
In SI derived units , these are both measured in lux (lx) or lumens per square metre (cd·sr·m-2). In the CGS system, the unit of illuminance is the phot . One phot is equal to 10,000 lux.
Illuminance was formerly often called brightness, but this leads to confusion with other uses of the word. "Brightness" should never be used for quantitative description, but only for nonquantitative references to physiological sensations and perceptions of light.

The human eye is capable of seeing somewhat more than a 2 trillion-fold range: The presence of white objects is somewhat discernible under starlight, at 5×10-5 lux, while at the bright end, it is possible to read large text at 108 lux, or about 1,000 times that of direct sunlight , although this can be very uncomfortable and cause long-lasting afterimages .