Monitoring and Quality Control
In the lighting industry, the focus is not only on manufacturers of different light bulbs and LEDs, but the companies involved in testing and validating these bulbs and LEDs, and the assembly of these products in, for instance, street lights and solar simulators as well.
Since these products emit light, the connection with spectroscopy is easily made. In this industry, spectroscopy is mostly utilized for real-time monitoring and quality control before, during and after the manufacturing process.
Radiometry and Photometry
Lighting is a form of electromagnetic radiation. Radiometry is essentially the measurement of the electromagnetic radiation or wave that is generated by the oscillation of photons. The frequency of these waves, or the wavelength, determines the amount of energy carried by the photons, and hence the ‘colour’ of the radiation. Within the field of radiometry, different parameters can be defined such as: irradiance, radiant flux and radiant intensity. Radiometry measurements can be done in the ultraviolet, visible and near-infrared wavelength ranges.
Photometry, on the other hand concerns the measurement of radiometric sources and their interaction with the human eye. Like radiometry, photometry involves different parameters, such as luminous flux, luminous intensity and illuminance.
Avantes instruments support radiometric measurements in the ultraviolet, visible, and near-infrared wavelength ranges from 250-2500 nm and photometric measurements in the visible range from 380-780 nm. For these applications, the AvaSpec-ULS2048CL-EVO is the most common option.
Identifying Lighting Products
Besides the above-mentioned parameters, other specific parameters are often used to describe the quality of a lighting product. Parameters describing the colour, dominant wavelengths and calculated colour temperatures are used to identify and document the specifics of different lighting products.
The lighting industry is rapidly progressing into the new dimensions of opportunity provided by solid-state lighting. Especially Light-Emitting Diodes (LEDs) and Organic LEDs (OLEDs) will replace traditional lightning and fluorescent lights in the coming decades. In order to have a uniform lightning, it is important that the LEDs that are used are matching in colour. These so-called colour parameters of LEDs can be determined by a radiometric calibrated fibre-coupled spectrometer, such as the AvaSpec-ULS2048CL-EVO. Important aspect of this application is the speed and accuracy with which the LEDs can be classified. The AvaSpec-ULS2048CL-EVO spectrometers can run at high-speed integration times and a data transfer times, allowing the LED sorting machine to run at maximum speed.
Why choose Avantes for your lighting application?
- Modular products for flexible setups
- Fast and accurate measurements
- Real-time process monitoring
- Calibration capabilities including intensity and field calibrations
These include some of the products mentioned in the application examples above. To find the perfect setup for your specific application, contact one of our sales engineers for advice.
Below are some detailed application notes on various uses of spectroscopy in the lighting industry.