Integrating Sphere Enables Precise Measurements for Large LED Modules

The GLS 1100 provides the basis for taking a wide variety of photometric measurements and can be used for entire modules and engines. Discussion surrounding the introduction of LED lighting equipment is frequently characterized by the question of energy efficiency, which is determined by quantifying the spectral characteristics of the respective luminous element and comparing them to conventional light sources. Key measurements are those required to assess the luminous flux and radiant power. Spectrally calibrated, the GLS 1100 is the ideal tool for this task and enables absolute measurement of radiant power and its spectral distribution. The absolute value and various photometric parameters can be measured simultaneously and include color coordinates, color temperature and the color rendering index (CRI) determined in accordance with CIE standards.

The energy consumption of the light source is derived from the measured values for luminous flux and radiant power. This, then, forms the basis for calculating the extent by which the electronic components, drivers and power supplies influence the spectral characteristics of the LEDs. The influence exerted by dimmers and cooling equipment can also be determined in this manner as can that of optical components such as lenses, reflectors and diffusers that are fitted together with the LEDs. The integrating sphere offers sufficient space for accommodating entire lamps and quantifying the spectral power of the overall product. The GLS 1100 can be used for all lamps, such as those found in street, emergency and vehicle lights as well as medical lighting equipment, and the product is particularly well suited to taking measurements for lamps comprising several LEDs.

GL Optic also supplies matching SpectroSoft software to ascertain these basic parameters and automatically determine many additional photometric variables such as the tristimulus value, chromaticity coordinates, color temperature, dominant wavelength, spectral purity (in percent), peak wavelength (in nm) and full width at half maximum of spectral lines.

Made from lightweight composite materials, the integrating sphere is easy to install and can be conveniently adapted to take measurements for different lamp types. Included in the configuration is an auxiliary light source to compensate for self-absorption and an adjustable sample holder. The GLS 1100 provides for extremely reliable measurement results and is precisely calibrated for LED measurements in accordance with CIE 127:2007. The product can also be used together with the mini or professional spectrometer from GL Optic, depending on budget and measuring requirements, whereby the GLS 1100 and mini spectrometer combination offers the best value on the market. An integrated plug-and-play concept further optimizes the measurement process, thereby minimizing the time it takes to launch new products, and the multifaceted performance of the GLS 1100 meets not only the development and quality assurance needs of lamp manufacturers, but also caters to scientific institutes, consultants, material researchers, and many other user groups.