The Illuminating Engineering Society of North America (IES) is the recognized technical authority on illumination,founded in 1906, it is a world famous lighting test institute.
IES LM-79-08 is the testing standard for Electrical and Photometric Measurements of Solid-State Lighting Products which was released in 2008.
This approved method describes the procedures and precautions for performing reproducible measurements of total luminous flux, electrical power, luminous intensity distribution and chromaticity of solid-state lighting (SSL) products for illumination purposes under standard conditions.
• Covers LED-based SSL products with control electronics and heat sinks incorporated. It does not cover external operating circuits or external heat sinks (e.g., LED chips, LED packages, and LED modules)
• Uses absolute photometry rather than relative photometry (historically the lighting industry standard) for the measurement of SSL.
Product testing report should include the following information:
The number of test parameters (total luminous flux, luminous efficiency, etc.);
Related energy value (an indication of the DC (frequency) or alternating current), the color temperature of the tested SSL product;
Running time before the test (new products should be 0);
Total running time including the settling time;
Product toward direction when testing (light position);
The photometric method or apparatus be used ( Spectroradiometer, using Spectroradiometer integrating sphere system as a probe, Goniophotometer, etc. ) ;
The name and type of reference standard ( power, lamp type, intensity distribution type - multi / single ), and sources;
Using the correction factor (eg, spectral detuning and self-detuning, intensity distribution, etc.);
Photometric conditions (means for Spectroradiometer ball diameter, coating reflection coefficient, 4π or 2π structure; on goniophotometer is luminosity distance);
Measurement of total luminous flux (lm) and the input voltage of each SSL products (V), current (A) and power (W);
Lumen intensity distribution (if applicable);
Color characteristics (chromaticity coordinates,Correlated color temperature white light products and / or color rendering index);
Spectral power distribution (if applicable);
Spectroradiometer bandwidth (if the report relating to the spectral distribution and / or color characteristics);
English name: integrating sphere
Definition: photometric measurement of the hollow sphere. The inner surface of the ball or without the wavelength selective coating (uniform) diffuse reflective white paint. The ball in either direction are equal illumination.
Integrating sphere, also known as luminous ball is a complete hollow round shell . Diffuse layer of wall painted white, and the inner wall of the ball-point diffuse evenly. S wall of light at any point in the ball B to generate the illumination light generated by multiple reflections of light intensity superposition.
Photometric integrating sphere according to color theory, the measured spectral power points measured body P (ie the measured spectrum in each of its energy value), measured by the machine to calculate the color of the light source parameters: chromaticity coordinates (XY) and (uv), correlated color temperature TC, color rendering index Ra, Ri (1-15), peak wavelength and half width. Therefore, the measured P is PMS-80/50 (enhanced) UV - visible - near infrared spectroscopy system, the fundamental task.
Integrating sphere light source light emitted by the fiber, is gathered in the monochromator entrance slit, the monochromator after by monochromatic light from the monochromator exit slit injection by the photomultiplier tube (PMT) convert into electrical signals, amplified by the circuit processing, A/D conversion, the digital signal into the computer. In addition, the computer sends the wavelength control signal, driving raster scan, to achieve spectral measurements.
1. The device is designed to exchange LEDT8/T10 tube (0.6-1.5 m) detection of aging.
By high-pressure, atmospheric pressure, low pressure, high temperature, roaming, analog voltage fluctuations on the lamp body on the line for the aging test. Check the tubes are all bright, flicker, color, appearance, and other bad quality and so on.
2. PLC control system, power system frequency control system.
3. With the beat, roaming, and the aging time can be set automatically.
4. Still Aging: Online body is not running the case, the power of aging.
5. Man-machine interface and PLC control system, programmable controllers, and sound and light equipment over-temperature alarm.