How Smart LEDs Lighting Benefit Color Temperature and Luminosity Transformation

Abstract

Luminosity and correlated color temperature (CCT) have gradually become two of the most important factors in the evaluation of the performance of light sources. However, although most color performance evaluation metrics are highly correlated with CCT, these metrics often do not account for light sources with different CCTs. This paper proposes the existence of a relationship between luminosity and CCT to remove the effects of CCT and to allow for a fairer judgment of light sources under the current color performance evaluation metrics. This paper utilizes the Hyper-Spectral Imaging (HSI) technique to recreate images of a standard color checker under different luminosities, CCT, and light sources. The images are then analyzed and transformed into interpolation figures and equal color difference curves. This paper utilizes statistic tools and symmetry properties to determine an exponential relationship between luminosity and CCT in red-green-blue (RGB) LED and OLED light sources. Such a relationship presents an option to remove the effects of CCT in color evaluation standards, as well as provide a guide line for adjusting visual experience solely by adjusting luminosity when creating a lighting system.

Single-Switch LED Post-Regulator Based on a Modified Class-E Resonant Converter with Voltage Clamp

“…The thermal behavior and the light depreciation along the LED life have also been improved thus making possible the construction of high power modules [2,3]. For example, there can be found currently in the market chip-on-board (COB) LED modules of more than 200 W. Another important feature of LEDs is their fast response and ease of control, enabling the implementation of complex control strategies [4][5][6]. All these improvements, combined with the continuous cost reduction that has taken place in recent years, have made LEDs the preferred choice for most lighting applications nowadays.…”

All-in-Focused Image Combination in the Frequency Domain Using Light Field Images

“…Their algorithm applies the DCT-STD and the DWT-STD for focus detection. Besides that, Chen et al have demonstrated a multi-spectral imaging method that can also show the color image reproduction [6][7][8]. While most previous methods for image combination employed a few inputs of different focal images, we attempt a new method for image composition using many input images.…”

“…Their algorithm applies the DCT-STD and the DWT-STD for focus detection. Besides that, Chen et al have demonstrated a multi-spectral imaging method that can also show the color image reproduction [6][7][8].…”

Identifying, Examining, and Planning Areas Protected from Light Pollution. The Case Study of Planning the First National Dark Sky Park in Greece

“…In recent years there has been a strong effort for making lighting design [1][2][3][4] and corresponding lighting systems [5][6][7][8] sustainable and environmentally friendly [9] either by selecting efficient luminaires [10,11], lighting controls [12][13][14][15], or embodying more efficient lighting design [16][17][18] or daylight [19][20][21][22][23]. The importance of avoiding light pollution (LP) has gained interest in technical reports [24,25] and expert discussions [26] only in the last few years.…”