Light measurement equipment BAseSpion

BaseSpion UV-VIS® is a specialized light measurement solution for testing UV light sources as well as ordinary luminaires in the same system – a gonioradiometer or a gonio-spectroradiometer.

It covers light source sizes from small lamps and LED chips to meadium-sized luminaires. The 2-axis BaseSpion UV goniometer allows the system to measure the entire 3D distribution field for any light source. Using a spectrometer sensor and a built-in power analyzer, the unique Viso technology enables fast measurements. The system gives you all photometric and radiometric data in one measurement. There is no need for an integration sphere. C omprehensive  LDT  and  IES  simulation files are standard outputs.

By using a goniospectrometer for UV measurements the problem of integrating sphere interior deterioration is avoided.

The BaseSpion UV-VIS light measurement system is the ideal way of measuring a wide variety of light sources ranging from all UV lamps and luminaires to standard fixtures and LED panels. The light source is easily attached to the goniometer and rotation is both quick and silent. The BaseSpion UV-VIS handles light sources up to 9 kg and 56 cm in diameter.

The BaseSpion UV-VIS system is quickly installed and comissioned. The measuring process is fully automatic with the option of manual operation. Data acquisition from a single C-plane takes 15-30 seconds, which means that takes roughly 15 minutes to collect data from all planes.

Measurement data is then automatically saved in a specific folder in the form of fixture files. They are usually exported into PDF, PNG, IES, LDT and CSV formats – and even UV IES-files. You can create your own custom pdf report templates. Read more about the Light Inspector software here.


All Viso’s UV sensors have straylight correction. As UV spectrometers need high sensitivity to handle low level signals, any small stray light reflections from within the spectrometer must be corrected for optimal performance. At Viso is this done performing a series of calibration test at multiple wavelength detecting all straylight and storing it in the calibration data. All straylight is then in real-time removed from the spectrum using mathematical matrix calculations based on the straylight test data.


Mirror-based gonioradiometer or a gonio-spectroradiometer are available in the market. However there are some important advantages of the Viso solution:

  • The UV sensor needs to be placed in a fixed distance in mirror-based systems. This means that it is not easy to adapt to the size and power of the light source. Typically, the mirror-based systems have the sensors in a distance of 9-15 m, where the Viso BaseSpion sensor distance can be optimized to the given light source, thereby optimizing the signal-to-noise ratio.
  • Standard mirror-based systems will not do since conventional glass mirrors are second surface mirrors – the UV light needs to pass a glass layer to meet and to leave the reflective surface. The float glass used for typical mirrors has a high UV abosrption. An aluminum-coated first surface mirror is a one technical solution. Viso measurement systems do not contain mirrors.
  • Mirror-based goniometers are chunky and will – if suitable for UV fixtures 3 to 5 feet long – take up a large 2-story laboratory space.


Measures UV light as well as visual light

Measures light sources up to 9 kg (20 lbs)/ Ø56 cm (21.3”)

Fits into relatively small laboratories

All color and lumen data – no integrating sphere needed

An advanced system which is very easy to operate

Output as customizable reports or raw data

Make your own calibrations with CALI-DT300 (included)

Version with UV-VIS-NIR sensor available (200-1100 nm)

Version with VIS-NIR sensor available (360-1000 nm)

Main applications


Get more information

Viso UV goniometer specialties

UV Spectral power distribution SPD

UV Spectral Distribution
Get the spectral power distribution in the full range from 200 nm (far UV) to 850 nm (near IR)

Dose plot

Get Dose Diagrams
Enter the a specific deactivation dose e.g. for COVID-19 and get overview of the dose time needed.

Response curve

Work with action spectra/ response curves
Bacteria and virusses respond differently to various wavelength. Enter custom response curves matching your specific germs

measurement setups2

Full radiometric output
Work with your favorite dynamical dashboard and output setup 

Reference lamp CALI-DT300 included

Dialux Evo simulation

CALI-DT300 Front side
Special calibration lamp CALI-DT300 is included
Deuterium and tungsten light sources

Calibration lamp DT300

CALI-DT300 Rear side
Make your own calibrations – save money and down-time

BaseSpion UV-VIS goniometer specifications

Measurement method
Far field, type C horizontal
(+Far field, type B through software)

Standard spectrometer range
Standard 200 – 850 nm
(UV-VIS-NIR 200 – 1100 nm possible)

Sensor distance range
35 cm to 450 cm
(13.8’’ – 14.8’)

Sensor distance setup
Standard automatic

Light source diameter range
0 – 54 cm @ 2-axis
(0 – 21.3” @ 2-axis)

Light source maximum weight
9 kg
(20 lbs)

Power supply input
90 to 260 VAC, 50/60 Hz

W/sr, Lumen, Peak cd, CCT, Spectrum, CRI, TM30, CQS, 3D Light Distribution, Power Specs, lm/W, UV Doses etc.

Popular additions

Add great tools to your system, capture more data and ease your work

The LabFlicker instrument records all contemporary flicker metrics including SVM and PstLM and connects to all Viso systems

Add a LabTemp 3-port temperature probe system for monitoring ambient lab temperature and 3 temperature spots

A typical BaseSpion setup

The setup will look more or less like this – but let’s discuss the best solution.