Part 3: What is Spectrum and Chromaticity

Описание: In Part 1 and Part 2, we explored Illuminance, CCT, CRI, TM-30, and SDCM.
Now in Part 3, we dive into two essential concepts: Spectrum and Chromaticity.

What Is a Spectrum?

A light spectrum shows how much light is emitted at each wavelength—from violet to red (380–780 nm). It reveals the composition and quality of a light source.

Spectrum Diagrams
🔹 X-axis = Wavelength (nm)
🔹 Y-axis = Light intensity

Key Spectrum Terms :
🔹 λ (Wavelength): Distance between wave peaks
🔹 λd (Dominant Wavelength): Perceived hue
🔹 λp (Peak Wavelength): Wavelength with the highest intensity
🔹 λpv (Peak Intensity): Maximum output at λp

Chromaticity = Color Without Brightness
Mapped on the CIE 1931 diagram using (x, y) coordinates:
🔹 Hue = the color
🔹 Saturation = how vivid or muted

Duv (Δu,v)
Shows how far a color is from ideal white on the CIE 1960 (u,v) diagram:

📌 Target Duv Ranges
General lighting: –0.006 to +0.006
High-quality lighting: –0.003 to +0.003

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