Why objects seem different in different light sources?

Living room objects in warm and cool white LED lights. Image source: integral-led

What is full spectrum light?
Full-spectrum source produces light throughout the entire visible spectrum. It is a neutral white light that has power distribution in all visible color wavelengths from 400 to 700nm.


Spectral distribution of different indoor light sources
Image source: Kim, Soyeon & Jahandar, Muhammad & Jeong, Jaehoon & Lim, Dong. (2019). Recent progress in solar cell technology for low-light indoor applications. Current Alternative Energy. 03.

Why objects seem different in different light sources?

Not all white light sources are perfectly white. They have different color power distribution in uneven white spectrum, often correlated by color temperature: cool or warm. Object absorbs or reflects colors depending on its own color properties and the color distribution of the applied light source. Objects appear redder under the illumination of warm white LEDs or in light during sunrise. Same way, objects seem bluer under cool white LEDs or in midday sunlight. Hence it becomes very important to carry out color measurement by using standard independent light source.


Sensegood Spectrophotometer
To achieve true color reflected from the object, balanced white light source must be applied. Sensegood Spectrophotometer is equipped with robust light source – Complementary compensating full spectrum long life 98+ CRI LEDs to take care uneven spectral power distribution of artificial light sources. Further spectral balancing is achieved by firmware algorithms.

Learn more about most affordable yet technologically advanced color measurement instruments:


Author:
Sanket Patel, Ph.D. Electronics
Dr. Sanket Patel is IEEE award winning researcher, technopreneur and a technology enthusiast
Location: 6B Arlington St, St. James's, London SW1A 1RE, UK

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