Pro Lite Technology

Signal & Sign Applications

Traffic Signal

The correct brightness, luminance uniformity and chromaticity of signals and signs helps to ensure that the information or warning message is clearly communicated.

Luminance Measurements

The Konica Minolta LS-100 and LS-110 are simple, affordable, hand-held photometers that provide for spot luminance (brightness) measurements. The Konica Minolta CS-100A is the colorimeter version of the LS-100. The accuracy of filter photometers is always reduced when measuring narrow spectrum light sources such as LEDs. The Konica Minolta CS-200 is a hybrid "spectral colorimeter" that combines the ease-of-use and relative affordability of the CS-100A with a colorimetric accuracy approaching that of the research-grade Konica Minolta CS-2000 spectroradiometer.

As the name suggests, "spot” photometers measure the brightness and colour of a signal one spot at a time. At most, you can select from up to five measurement spot sizes, either by fitting close-up lenses or by selecting alternate measurement apertures in the photometer. If a more flexible and productive (albeit more costly) solution is more your thing, you should consider an an imaging photometer, specifically a ProMetric CCD imaging photometer made by Radiant Imaging.

ProMetric imaging photometers are powerful, CCD-based spatial light and colour measurement instruments that provide for increased productivity compared with traditional spot photometers and colorimeters. Whereas a spot photometer can only measure the brightness and colour of one point on a signal at a time, a CCD-based ProMetric photometer can measure literally millions of points simultaneously. The measurement spot size can be selected in software after the measurement has been made, and moreover, any number of analysis points can be defined - and recalled - as required. In addition, because the ProMetric camera views the whole display at once, localised luminance and colour differences (defects) can be easily detected automatically – artefacts that spot meters might miss.

An application-specific, software "bolt-on" has been developed for the ProMetric imaging photometers for those working with LED-based signals. PM-LED Measurement software accurately determines the colour and brightness of each individual LED emitter in an array or panel. Typical applications include LED panels, display signs and traffic signals. A simplified user interface automates many aspects of testing, including panel alignment.

View Angle Measurements

The instrument used for measuring the angular variation from a signal is called a goniophotometer. Radiant Imaging PM-NFMS goniophotometer exploits the latest advances in imaging photometry to make signal measurements more accessible and affordable. Rather than using an illuminance meter in the photometric far-field to record illuminance as a function of angle, the PM-NFMS employs a ProMetric CCD imaging photometer to record spatially-resolved images of the near-field luminance emitted from the light source. Spatially-resolved images of the source luminance are recorded in Radiant Imaging's proprietary ProSource (.rs8) format for one angle of azimuth and elevation at a time. The associated, motorised goniometer stage scans the device under test over ± 88° in all directions. Radiant Imaging's ProSource software then performs a ray-tracing operation to scale the near-field luminance readings to equivalent far-field illuminance values at the click of a mouse.

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