Page 128 - Catalog auto parts lighting technology BOSCH for cars and trucks

Auto Parts / A126 | Automotive bulbs

Basic lighting-technology terms

“DIN 5033 standard table”

Below, we outline some of the basic Luminous flux Luminance
principles of lighting technology, the “tool” Luminous flux is the term used for the total The luminance of a light source or an
used to create light. radiant power emitted by the light source illuminated surface is a measure of the
in the wavelength range of visible light, “apparent brightness”. It is the luminous
Light irrespective of the emission direction. flux relative to a particular surface area.
Light is propagated in the form of an Unit: Lumen [lm]. The human eye perceives differences in
electromagnetic wave. The human eye can luminance as differences in brightness.
only recognize a limited range (wavelength Illumination The brightness of a candle is approximately
380 to 780 nm) of these waves as light The illumination is the amount of light that 1 cd (Candela). Automotive bulbs are in the
beams. The wavelength of the radiation is beamed in a particular spatial direction. magnitude of 10 cd for tail lamps, 100 cd for
determines the color of the light, from violet It is made up of the ratio of the luminous- stop lamps, 200 cd for fog warning lamps
(380 nm) to red (780 nm) with the inter- flux component and the associated solid- and more than 200,000 cd for headlamps.
mediate colors blue, green, yellow and angle component. Unit: Candela per square meter [cd/m ].
2
orange, as can be seen in a rainbow. Unit: Candela [cd].

Bosch Automotive Aftermarket 2010 | 2011 / Auto Parts

(adsbygoogle = window.adsbygoogle || []).push({});