Distribution and Radiation Method for Measuring the Ultraviolet Radiation Flux 3: The Measuring System
Based on the characteristics of the above four kinds of measuring system, we have adopted light source movement method, as shown in figure 2. The light source can rotate around the horizontal axis that is the same with the light source axis, and can rotate around the vertical axis that is perpendicular to the light source. […]
Building Energy Saving and Luminous Environment Design
In recent years, building energy saving is required by the energy crisis, environmental protection and the improvement of living standards. Building energy saving has been the common choice of world’s architectural community after thoughtful for a long time. So, what is exactly energy-saving building, what is its benefit, why does everybody concern about it so […]
Distribution and Radiation Method for Measuring the Ultraviolet Radiation Flux 2: Principles
Principle of measurement The measuring principle of distribution and radiation method is based on the spherical coordinate system, as shown in picture 1. Picture 1 spherical coordinate system Through measuring the irradiance of the sphere surface, if the light source is taken as the origin of the spherical coordinate, θ is taken as the polar […]
Distribution and Radiation Method for Measuring the Ultraviolet Radiation Flux 1: Definition and Characteristics of Ultraviolet Radiation
Abstract: In recent years, with more and more attention is paid to the UV light source, people attach more importance to the evaluation. The total radiation flux is one of the most important technology indexes of UV light source. This paper describes the basic principle and method of using the distribution Spectrophotometer to measure the […]
Professional Knowledge About LED Electrostatic 4
Question: How to effectively improve LED a static ability? What are the protective measures? There are no direct measures to improve LED antistatic ability, or once LED is produced out, its antistatic index is confirmed. There is no effective method to improve its antistatic index. If LED antistatic ability is not high enough, we can […]
Color Temperature and Brightness
Color Temperature （Color Temperature Meter） Unite: Absolute Temprature (Kelvin, K) Unite of color temperature is absolute temperature K. When heat one black body radiator, for example Platinum, color of the black body radiator will change from Red, to Orange, Yellow, Green, Blue, Cyan, Purple gradually. We can use this character of black body to definition […]
Professional Knowledge About LED Electrostatic 3
Question: which kind of method can be used to evaluate and test the antistatic ability of LED? Most of the enterprise evaluates the antistatic ability of LED with the attitude of having a try. Actually, this is an assessment method of long cycle length, great error, high cost and risk. Millimeter is used to test […]
Calculation Model for LED Lighting Heating Transfer|LED Thermal Resistance Algorithm
Take a calculation for example, this shows the equivalent circuit of the LED thermal resistance algorithm. Following is the basic structure that lamps requirements, LED was enclosed in a sealed plastic enclosure, the right side of the insulation blanket is thicker, and the heat conduction basic can be neglected comparing the other part of the thermal conductivity. Heat […]
Professional Knowledge About LED Electrostatic 2
Question: What is the principle and process of LED breakdown and damage by LED static? LED belongs to the semiconductor components, its PN junction is directly bared outside, it is easy to be damaged by the static. When the electric charge of different polarities on the two poles of LED (induction produces the charge produced […]
LSG-1800: Automatic Goniophotometric Measurement System
This horizontal goniophotometer is another goniophotometric system that we often use. The test distance of the detector of the test system is between 1.41m and 11.41m. The lamp is installed on the turntable that can rotate around the horizontal and vertical direction. The vertical axis line of the turntable is fixable, the horizontal axis is […]
Professional Knowledge About LED Electrostatic 1
Question: What is the static electricity? How does it arise? The electric charge is transferred because of the existence of the electric charge and electric field, so as to form the two energies with the voltage of the opposite polarity, namely the static electricity. Static electricity is not the stationary electricity; it has the same […]
Large Goniophotometric System: Goniophotometer With Rotating Mirror
At present, goniophotometers we often use basically have two sets, goniophotometer with rotating mirror is one of them. The detector of this kind of system is fixed on the position of 19.83 m; the constant temperature device added on the detector makes the temperature keep 35℃. This testing system has three rotation axes. The spindle […]
Some Knots Need to Pay Attention to In Order to Get the Accurate Photometric Data
The following knots need to pay attention to in order to get the accurate photometric data: a) Luminosity measured distance The luminous intensity measurement is to measure the illumination of a certain distance; the light intensity value can be got through calculating the inverse distance square principle in photometry, namely I, E, R2. In this […]
The Distribution Photometric Measurement Is The Key Link Of The Quality Control In Lamps and illumination design
For the lighting industry, lamps and lanterns play a very important role. A good lighting design is realized by choosing the appropriate lamps. Choosing the appropriate lamps and lanterns and building a reasonable and comfortable lighting environment, can not only meet the needs of People’s Daily life, but also provide a safe, energy-saving and high-efficiency […]
Knowledge About Light Color
Color Trichroism: Hue: The character of distinguishing colors is determined by dominant wavelength of color light. Lightness: The feel of eyes to the lightness degree of color. Chroma: The feel to the color purity, also called “saturation”. Descrimination to the color is related to the light wavelength, it is discrepant to the sensitivity of the different […]
Recommended Illuminance Range for Different Applications
Number Illuminance Range (LX) Locations or Activity Type 1 20-30-50 Outdoor living space and workplace. E.g. corridor, store room, stairwell, bathroom, café, bar, station advertising. etc. 2 30-100-150 Circulation places and hop directional position. E.g. elevator former room, room service desk, bar counter, indoor food market hall, duty room, posts and telecommunications, recreation hall, […]
Basic Knowledge About Lighting
Item Symbol Unit Description Beam( Luminous Flux ) Φ (Lm) The sum of the light source issued every second, simple as glow amount. Light Intensity I (Cd) The strength of the light, the amount of radiation in a particular direction angle. Illuminance ( Luminance Meter) E (Lm/m2) The amount of radiation in unit area, that is […]
High-Frequency Current-Voltage Characters Measurement
Summary: Fluorescent high-frequency measurement techniques have been widely accepted, after the measuring methods and instruments turn up which were recommended by national standard GB/T10682 2002.This article discusses the two measuring methods used by the present light industry, that is “national standard method” and ”constant-current method”. Key words: Electronic ballast tester, High-frequency current source, High-frequency current-voltage […]
