Lighter or darker?

The incident white light ray separates into its constituent colours upon refraction

Light is measured with two main alternative sets of units: radiometry consists of measurements of light power at all wavelengths, while photometry measures light with wavelength weighted with respect to a standardized model of human brightness perception. There are different SI units for both systems.
The photometry units are different from most systems of physical units in that they take into account how the human eye responds to light. Photometry is useful, for example, to quantify Illumination (lighting) intended for human use.

The light and dark side of Caravaggio

Caravaggio, "The Calling of Saint Matthew" (1599-1600)

Chiaroscuro in art is characterized by weak contrasts between light and dark. This tecnique was practiced long before Caravaggio came on the scene, but he was the one who made the technique definitive, darkening the shadows and transfixing the subject in a blinding shaft of light.


In "The calling of Saint Matthew", the beam of light, which enters the picture from the direction of a real window, expresses in the blink of an eye the conversion of St Matthew.

Chinese Go game 围棋（weí qí）

The Go game:
Chinese ： 围棋（weí qí ）
Japanese: 碁
Korean hangul: 바둑


The explained the history and the rules of the GO game:
http://en.wikipedia.org/wiki/Go_(game)


The meaning of the GO game:
In China it includes the philosophy of life——how to be a good person; Reaction the Taoism thought. It’s emphasis on the natural and harmony. Life likes the chesses, include the advancement and give up. When we gain, we feel nothing; when we lost, we can think it doesn’t matter. The principle of the Go means the philosophy of life. The black and white chesses represent the attitude of the world.

Light can be a problem...!

This spot by Ray-Ban ironically suggests that light could be dangerous: the protagonists are vampires!... If you are a vampire, light do not have positive meanings, because you can live only in the darkness of night. Dark means life and light means death.
But if you wear Ray-Ban sunglasses.. even if you are a vampire, light is no longer a problem!

The implication of "light and dark "



We try to understand the concept of light and dark through events, people, pictures, things that may be related to the good (light) evil (dark).

Concrete wall light

Contrary to Litracon®, in Litracon pXL® there are no optical fibers for light transmission but a specially formed and patented plastic unit.
The light dots appear with regular distribution on the surface of the pXL® panels just like pixels on an LCD screen. Besides, it is easy to create patterns or even coloured logos out of the pixels.


Clic here to view patent images.

Light/dark in the world

italian: luce/ombra, chiaro/scuro

arabian: الضوء / الظلام (aḑ-dwʼ/az̧-zlām)
chinese: 光 / 暗 (guang/àn)
english: light/dark
french: claire/sombre
german: licht/dunkel
greek: φως/σκοτάδι (fo̱s/skotádi)
dutch: licht/donker
romanian: lumina/întuneric
russian: света/темно (sveta/temno)
serbia: светло/мрак (svetlo/mrak)
spanish: claro/oscuro
swedish: ljus/mörk
japanese: 明 / 暗 (mei/kura)
spanish: luz/oscuridad
turkish: açık/koyu
ukrainian: світла/темно (svitla/temno)
hungarian: fény/sötét