Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Modular Led Luminaire With Variable Spectral Power Distribution Of Luminous Flux
Parma, Mikuláš
To date, development of luminaires is focused primarily on energy performance levels and accepted colour qualities of light output. Recent researches aimed to healthy and smart lighting showed that standard properties of luminaires are insufficient in terms of all performance levels required for modern illuminating systems. Dynamic change of intensity and colour temperature of light source during day is necessary for right function of human circadian system. Therefore it was developed modular LED luminaire allowing dynamic change of the spectral power distribution of luminous flux with possibility of colour temperature changing in the range 2400 K - 10 000 K (Ra >90, uv < 0.0005) and also possibility to set any hue in the colour gamut given by fixture construction.
Srovnání spektrální distribuce různých světelných zdrojů s ohledem na lidský cirkadiální systém
Parma, Mikuláš ; Baxant, Petr ; Škoda, Jan
Non-visual effect of light to human beings are still intensively researched in these days. This paper is focused on investigation of spectral power distribution (SPD) of various light sources in correlation to human circadian system. They were chosen light sources suitable for residential lighting including modern light emitting diodes (LED) with different correlated colour temperatures (CCT), which was normalized to same luminous flux value so that comparison would be reliable. It is known that non-visual photoreceptors via melanopsin photoreceptors (intrinsic photosensitive Retinal Ganglion Cells-ipRGCs), which are co-responsible for synchronization of circadian rhythm, requires blue spectral components in the light with a maximum spectral sensitivity around 460 – 480 nm, therefore this spectral region was studied in details.

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