Photometry by Viso

”Easy to use’ is the mantra for Viso engineers.

Many measurement device suppliers can make good mechanical systems – but what about software? Your ability to get the most out of your light measurement solution is closely linked to the software solution.

We take pride in producing the market-leading metering software – thereby making it as easy as possible for you to work with. It is easy to start a new measurement, easy to generate reports and easy to analyze results.

Therefore, you do not need much experience to get started. Still, experienced lighting lab technicians will not be disappointed: the Viso Light Inspector software also provides plenty of detailed analysis options.

Your feedback is important to us. Do not hesitate to share your ideas or challenges at info@visosystems.com. We often release new beta versions to share new features with you as quickly as possible.

Luminaires for professional use must be characterised. The basic input for all lighting design is a 3D file quantifying the light emission in all directions (photometry), i.e. the total light output and possibly also the colour characteristics (spectral distribution, CCT, CRI, etc.).

For these measurements, a mechanical arrangement is needed to measure all around the light source: a goniometer. In practice, it is necessary to select a limited number of measurement angles (gamma, γ) distributed in a set of measurement planes (C-planes).

In photometric systems with Viso technology, the light sources are mounted on the goniometer with the main light output directed horizontally towards the sensor. For most light sources this means that the normally vertical axis will be rotated horizontally. Nevertheless, measurements can be made according to the CIE S 025 standard.

The heart of every Viso measurement system is the fast spectrometer sensor. With a spectrometer instead of a photometer the system captures light spectra and not just light quantities. This unique feature enables the system to measure much more than lumen packages and light distributions: All color data (e.g. CRI, CCT, TM30 etc.) and even color over angle. Hence, a Viso goniospectrometer will make an integrating sphere redundant. Read more here.

Our spectrometer sensors are based on cutting-edge, transmission grating technology. Continuous (not stepped) goniometer movement makes it possible to complete a C-plane measurement in only 30 seconds. Consequenty, the data acquisition time for a light measurement exceptionally fast.

The Light Inspector ^® is easy and intuitive to use – yet gives you all the details you would expect and a lot more.

The dashboard gives you a live preview of the measurement. Furthermore, underlying menus enable you to set your own measurement preferences. Measurement data can be exported in every detail or as customized pdf reports.

Your inputs to our software developers are important to us – improving the software and adding features to make your laboratory even smarter is key to Viso’s success.

Viso offers a full-fledged light measurement system that can be fitted in almost in any building. Our biggest system only needs a space of around H2.5 x W2.5 x L10 m to make the perfect laboratory.

Our smallest system fits into a suitcase and can be brought with you everywhere, even on air flights.

All Viso goniospectrometer systems include a built-in power analyzer. Hence, given that you have a steady mains supply there is no need for an external power supply. The system will analyze the power situation in every measurement. Automatic start-up procedures will guarantee proper light source warm-up and steady power feed during test. Output data includes power data, efficacy, and even power and displacement factors.  

To measure light, i.e. to capture the luminous flux emitted from a light source into space, it is important either to create darkness or to separate the background lighting from the measured light source. Although we recommend taking photometric measurements without ambient light, Viso technology allows you to correct for ambient light in the Viso Light Inspector software.

Data collection consists of two steps: first, the backlight alone is measured while the test light source is off. Then the measurement is continued with the light source on. Using Viso’s unique algorithm, the background light measurement is then subtracted from the total light measurement.