The Parameters of LED Device 1. Luminous Flux and luminous efficacy LED luminous flux is the amount of light emitted per unit time, and LED luminous efficacy is the LED luminous flux per unit power. They both indicate the luminous...
What are the characteristics of LED phosphors and their impacts on the performance of packaged LEDs? The performance of LED phosphors mainly can be divided into the powder properties, particle size distribution, and stability (aging performance), etc. Usually, luminescent performance...
What is LED phosphor？ LED phosphor, in a narrow sense, is a kind of Photoluminescent materials can absorb the energy of violet and blue light from gallium nitride or other LED chip, and transform it into visible light. Phosphors are...
Part 2. Light Intensity In color management and print quality verification processes, visual assessment of colors is a key. In order to acquire color accuracy, a proper lighting condition becomes a must. The ISO3664:2009 standard specifies a set of five...
Part 1. Color Quality While color and density measurements play important roles in the control of color reproduction, they cannot replace the human observer for final assessment of the quality of complex images. Color reflection artwork, photographic transparencies, photographic prints...
In the Swedish capital of Stockholm in winter, whenever the sun sets at 15:00 pm, the whole city sinks into the dark and gloomy. More than half of people in this environment will become depressed and lethargic, and looks like...
Near-infrared spectroscopy history and principle Infrared light is a portion between the visible and microwave regions of the electromagnetic spectrum ranging from 700 nm to 1 mm. Infrared light was discovered by a German-British astronomer named William Herschel in 1800...
CIE 1931 The CIE 1931 were created by the International Commission on Illumination (CIE) in 1931. And this is the first time human created an explanation between distributions of wavelengths in the visible spectrum, and colors can be perceived in...
We often see luminous flux or illumination data on the packaging of light bulbs or other lamps. Maybe you know these two parameters are used to describe the brightness of light. But what are the specific definitions of luminous flux...
Scientific research indicates that light is one of the main driving forces of the circadian system, whether it is natural sunlight or artificial light sources, they are all can trigger a series of physiological rhythm reactions. As we all know,...
Background Generally, in order to meet the new demand of solid-state lighting (SSL) market and communicate with consumers about the color quality of lighting products, NIST (National Institute of Standards and Technology) has developed the light color quality meter, which...
The feeling of the sunlight, as we know, is different from morning till night in nature. According to the position where the sun moves in the sky, the color of the sun will turn into red, orange, yellow, and white....