LED – Luminaire Photometry and Design
27 and 28 October at Birmingham Science Park
8.30. Registration and coffee
9.30 Session 1
Basic Concepts - Light & the Human Visual System
Light and the electromagnetic spectrum
Mesopic & scotopic vision
Basic Concepts - the Optical Properties of Materials
Diffuse reflectance & transmittance
Lambert's cosine law
Specular reflectance & transmittance
BRDF and scatterometry
The inverse squared & cosine rules
Photometric field - near-field versus far-field
Converting between units
10.30. Coffee and Networking.
11.00 Session 2
Colour vision and tristimulus theory
CIE colour spaces
Spectral power distributions
Computation of photometric & colorimetric quantities
13.15 Session 3
LED Photometry & Colorimetry – Practical (Dr Gareth John, Birmingham Science
a. Making Measurements – Practical Hints & Tips
i. Luminous Flux
ii. Illuminance/Luminous Intensity
b. Photometry versus spectroradiometry
c. Practical Hints & Tips
15.15 Session 4.
LED Luminaire Design (Dr Neil Haigh, Blueside Photonics.)
e. Luminaire Design Considerations, luminaire efficacy.
f. “Useful light”- talk about uniformity ratios, getting the light to where you need it.
Task efficacy, application efficacy.
g. Standard Photometric Data – Understanding the Formats (IES, EULUMDAT)
h. Presentation of lighting data- cone diagrams- how to calculate the cone angle for
various applications, how does it vary between different industries, e.g., theatrical,
i. Lighting System Application Efficacy
j. Artificial optical hazard directive.
k. Use of Lighting Design Software (RELUX, Photometric toolbox). How well do they deal
with LEDs? What are the differences between the different programs?
1630. Lab tour and close
Day 2: Practical session
8.30 registration and coffee
9.30 How to make a photometric measurement
Dr Gareth John shows the delegates how to carry out photometric, goniophotometric,
Spectroradiometric, colorimetric and thermographic measurements on an LED luminaire. This
session will cover measurements of total luminous flux, luminous intensity, illuminance,
correlated colour temperature, colour rendering index, temperature and the importance of the
colour correction factor.