Pro Lite Technology

Photometry, Colorimetry & Spectroradiometry -
a Training Course on the Science of Light Measurement

Photometric Training Course 

The training course defines the basic science and metrics used in the photometry, colorimetry, spectroradiometry and goniophotometry of light sources and in particular LEDs and Solid State Lighting. LEDs are being used in increasing numbers in lighting and display applications, ranging from solid state lighting luminaires, display backlights, large area video displays and signage. The human eye is very sensitive to brightness and colour differences and the problem with LEDs is they cannot be manufactured with consistent optical properties, even within the same batch. This makes measuring LED output an important activity, but their small size, narrow spectral emissions, directionality and temperature dependence mean that traditional photometric and colorimetric measurement methods are not always the most appropriate. The course will explain the metrics used to describe the output of LEDs and luminaires, present the concept of useful light, review current industry standards and provide an overview of the available test equipment.

An overview of the course content follows. Pro-Lite is happy to tailor the course to suit specific needs. The course can be delivered at a client's site or at Pro-Lite's facility where delegates will benefit from access to our state-of-the-art photometric dark room and hands-on time wiith our photometers, integrating sphere systems, spectroradiometers and near-field goniophotometer.

To discuss your training requirements, please use our enquiry form.

Photometric Field

Course Overview

Basic Concepts - Light & the Human Visual System
      Light and the electromagnetic spectrum
      Photopic response
      Mesopic & scotopic vision

Basic Concepts - the Optical Properties of Materials
       Diffuse reflectance & transmittance
       Lambert's cosine law
       Specular reflectance & transmittance
       BRDF and scatterometry

Photometry
      Luminous flux
      Illuminance
      Luminous intensity
      Luminance
      The invserse squared & cosine rules
      Photometric field - near-field versus far-field
      Converting between units

Colorimetry
      Colour vision and tristimulus theory
      CIE colour spaces
      Chromaticity
      Colour temperature
      Standard illuminants
      Dominant wavelength
      Colour differences

Spectroradiometry
      Spectral power distributions
      Computation of photometric & colorimetric quantities
      Colour rendering

Goniophotometry
      Coordinate systems
      Near-field goniophotometry
      Far-field goniophotometry
      Standard photometric data

Choosing Light Measurement Equipment
      Photometers
      Colorimeters
      Spectroradiometers
      Goniophotometers
      Spectrophotometers
      Scatterometers

LEDs & Solid State Lighting - the Measurement Challenges
     LED binning & the effect on intensity & colour
     LED phosphors & the effect on colour
     Standards - CIE 127
     Standards - IESNA LM 79 & 80
     Spectral considerations
     Geometric considerations
     Electrical considerations
     Thermal considerations
     Special considerations when choosing equipment for testing LEDs

Related Products
Datasheets
Brochures
Case Studies
Knowledge Base

> Light Measurement

Are your bulbs simply incandescent? Have your candelas got nits? Are your white LEDs suffering with the blues? Are your luminaires failing to illuminate? For the answers to these and many other questions, we've compiled our light measurement knowledge base. Learn about the science of photometry, colorimetry and spectroradiometry.

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Need a measurement?

Contract measurement services are available from Pro-Lite Photometrics using this product

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