Archive for the ‘ Unified profiles database ’ Category

CHARACTERIZATION OF EQUALLY CONSPICIOUS RGBAC SPOTLIGHTS

By adding cyan and amber to red, green and blue LEDs the color gamut of a spot is considerably extended. To test conspicuity of chromatic light a chromatic patch was projected on a wall and was compared to an achromatic one. Below are the profiles for seven stimuli that demonstrate equal conspicuity measures.


 

CHARACTERIZATION OF EQUALLY CONSPICIOUS RGB SPOTLIGHTS

The Helmholtz-Kohlrausch effect is the influence of color purity on the perceived brightness of a surface. In the following are spectral characteristics of stimuli given that have proven to attract attention equally strong. The high spectral purity that colored LED sources can provide induces the perception of considerable brightness. To test conspicuity a chromatic light patch on a wall was compared to an achromatic one. Below are the profiles given for blue, green, red and purple stimuli that demonstrate equal conspicuity measures than a white spot with a luminance of 10.1 cd/m².

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CHARACTERIZATION OF LIGHT SOURCES – LED 3000K / 4000K

In this new series light sources, surface characteristics and visual stimuli are characterized by unified profiles. Information about unified profiles to describe spectral data you can find here.

Below two phosphor-converted white LEDs are compared. Light with a Correlated Color Temperature of 4000K causes usually a more cool and bluish impression than light with a CCT of 3000K.

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