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Color Measurement: Explaining Color Space and Gamut

The CIE chromaticity diagram maps the average spectral sensitivity of the human eye. This specifies any visible color as a function of three parameters, or tristimulus values, which are analogous to the average sensitivity of human vision to different hues. This method of color measurement was popularised by the CIE 1931 standard. The color space […]

Reproducibility Challenges for LED Measurement Instruments

The emergence of solid-state lighting (SSL) has rapidly eclipsed the performance and efficiency capacities of incandescent light bulbs. This technology includes LEDs and emerging organic light emitting diodes (OLEDs), which represent exciting potential for future lighting applications. Despite the tantalizing possibilities of OLED technologies, LEDs are still expected to occupy as much as 70% of […]

Color measurement and white point adjustment for automotive R&D

The quality of lighting and displays in the automotive industry are critical design factors. Accurately measuring the colors emitted from the lights and displays enables precise, high-quality results. This article outlines the major solutions for accurate color measurement in vehicle design and manufacturing. The automotive market is becoming increasingly competitive. Consumers are demanding better, safer, […]

What are Transmission Measurements?

Whenever incident light hits a surface it is either reflected, absorbed, or transmitted. Reflection refers to light which is rejected at the interface and redirected back into the media through which it was already propagating. Absorption refers to the amount of energy lost to the electrons in sample matter as a light wave propagates through […]

Colorimetry in perspective of the human eye

Colorimetry is the science used to quantify colour in perspective of the human eye The science of measuring colour and the appearance of colour is vital: Perception of colour is a subjective process where the brain responds to stimuli produced when incoming light reacts with the several different types of cone cells of the human […]

The Changing Landscape of Display Tests

The display sector is characterized by rapid periods of growth and innovation when competing technologies occupy large portions of the same market space. Cathode ray tube displays were supplanted by the rise of lightweight liquid crystal display (LCD) matrices, later on with light-emitting diode (LED) backlights, and now LCDs are experiencing significant market competition from […]

What is a Cuvette Holder?

A cuvette holder is a specialized light measurement accessory designed to maintain high accuracy levels during transmission measurements of liquids. Assessing the transmission spectra of a translucent material is an incredibly sensitive process that requires polymer cells or glass substrates to be handled with extreme care, mechanical stability and cleaned thoroughly between uses. Small molecules […]

Measurement Instruments for Luminous Intensity

Light measurements can be divided into a series of measurement principles, each of which is quantified according to different optical parameters. Photometric measurements, for example, are expressed according to the responses of the human eye. This is based on an averaged spectral sensitivity known as the Vλ luminosity function, which categorizes wavelengths of green-yellow light […]

Using Light- and Colorimeters for Spot Measurements

Modern displays are subject to optical variations at different stages in the production process. Colour and luminance quality can fluctuate due to light-emitting diode (LED) batch inconsistencies or quirks, but this does not necessarily constitute component failure. This could merely be a product of the rapid-throughput production cycles and the complex arrangements of LED backlights, […]

Outlining the Applications of a VIS Spectrophotometer

A VIS spectrophotometer is a quantitative tool for analyzing the visible spectral properties of a sample with outstanding degrees of accuracy. It can acquire the intensity of a light source at wavelengths of between 380 – 780 nm, with integrated processors capable of running independent calculations and providing rapid assessments of a lighting product’s spectral […]