Sensor Electronic Technology, Inc.

Vilnius University

Vilniaus Universitetas;

Rimantas Vaicekauskas

Arturas Zukauskas

Michael Shur

Henrikas Vaitkevicius

Feliksas Ivanauskas

Pranciskus Vitta

Arunas Tuzikas

Akvile Zabiliute

Andrius Petrulis

Feliksas Ivanaukas

Polychromatic light sources of white light, which have spectral power distributions composed of at least three different components, such as clusters of colored light-emitting diodes (LEDs) or LEDs with partial or complete conversion in phosphors. Disclosed are the peak wavelengths and relative partial radiant fluxes of the spectral components that allow rendering certain fractions of an extended color palette with high fidelity and with increased chromatic saturation, respectively, and hence meeting subjective preferences to color quality of illumination.

Solid-state sources of light for preferential colour rendition

The configuration of polychromatic sources of white light, which are composed of at least two groups of colored emitters, such as light-emitting diodes (LEDs), is disclosed. Based on a novel approach of the assessment of quality of white light using, for example, 1269 test color samples from the enhanced Munsell palette, the spectral compositions of light, such as white light, composed of two to five (or more) narrow-band emissions with the highest number of colors relevant to human vision rendered almost indistinguishably from a reference source, such as a blackbody radiator, are introduced. An embodiment of the current invention can be used, in particular, for configuring polychromatic sources of white light with the ultimate quality capable of rendering of all colors of the real world.

Multiwavelength solid-state lamps with an enhanced number of rendered colors

The current invention discloses polychromatic sources of white light, which are composed of at least two groups of colored emitters, such as light-emitting diodes (LEDs) are disclosed. Based on a novel approach of the assessment of quality of white light using 1269 test color samples from the enhanced Munsell palette, the spectral compositions of white light composed of two to five (or more) narrow-band emissions with the highest number of colors relevant to human vision rendered almost indistinguishably from a blackbody radiator are introduced. An embodiment of the current invention can be used, in particular, for designing polychromatic sources of white light with the ultimate quality capable of rendering of all colors of the real world.

The invention relates to phosphor-conversion (PC) sources of white light, which are composed of at least two groups of emitters, such as blue electroluminescent light-emitting diodes (LEDs) and wide-band (WB) or narrow-band (NB) phosphors that partially absorb and convert the flux generated by the LEDs to other wavelengths, and to improving the quality of the white light emitted by such light sources. In particular, embodiments of the present invention describe new 3-4 component combinations of peak wavelengths and bandwidths for white PC LEDs with partial conversion. These combinations are used to provide spectral power distributions that enable lighting with a considerable portion of a high number of spectrophotometrically calibrated colors rendered almost indistinguishably from a blackbody radiator or daylight illuminant, and which differ from distributions optimized using standard color-rendering assessment procedures based on a small number of test samples.

Solid-state lamps with partial conversion in phosphors for rendering an enhanced number of colors

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Vilnius, Lithuania

Rimantas Vaicekauskas