LED Fundamentals

Optical and LightingOptical and Lighting Software

01-03-2012

What is the Difference Between “Optical Software” andWhat is the Difference Between Optical Software and “Lighting Software”?

Lighting SoftwareOptical SoftwareHigh-end software packages Design & analysis of optical systemRaytrace

Lighting design; look & feel of the scene Analysis of application

Lighting SoftwareOptical Software

RaytracePrecisionPackage-specific rayfiles

y ppSpeedIES or Eulumdat distribution files

LED Fundamentals | Optical and Lighting Software | Page 2

When do I Need Optical Software?

Optical SoftwareDesign optical elements (lenses, reflectors)Design & analysis of complete optical system Surface treatments

Optical Software

Surface treatments Materials Lit appearance (glare)RaytraceyPackage-specific rayfiles

LED Fundamentals | Optical and Lighting Software | Page 3

What are Rayfiles?

Tabulated data with the properties of each ray exiting the LED: Coordinates of the ray starting point (x, y, z) Direction of the ray (kx, ky, kz) Power/flux of the rayo e / u o e ay For some optical software, the wavelength of the ray

LED Fundamentals | Optical and Lighting Software | Page 4

Rayfiles are generated in one of two ways:

How are Rayfiles Generated?

Simulation

y g y

Measurement

Optical model which considers: Bi-directional Scattering Distribution

Functions (BSDF’s) of package materialsChi i i tt

Rayfile created via: Using a near-field goniometer Luminance pictures are measured from

i l d th LED Chip emission patterns Complex geometrical features within the

LED package Mie scattering of diffusers

various angles around the LED Using a special algorithm, the collection of

luminance pictures are converted to rays Ray data is converted to rayfiles of different Mie scattering of diffusers

Wavelength conversion by phosphors Ray data is converted to rayfiles of different

software format.

LED Fundamentals | Optical and Lighting Software | Page 5

Rayfiles are generated in one of two ways:

How are Rayfiles Generated?

Simulation

y g y

Optical model which considers: Bi-directional Scattering Distribution

Functions (BSDF’s) of package materialsChi i i tt Chip emission patterns

Complex geometrical features within the LED package

Mie scattering of diffusors Mie scattering of diffusors Wavelength conversion by phosphors

LED Fundamentals | Optical and Lighting Software | Page 6

Rayfiles are generated in one of two ways:

How are Rayfiles Generated?y g y

Measurement

Rayfile created via: Using a near-field goniometer Luminance pictures are measured from

i l d th LEDvarious angles around the LED Using a special algorithm, the collection of

luminance pictures are converted to rays Ray data is converted to rayfiles of different Ray data is converted to rayfiles of different

software format.

LED Fundamentals | Optical and Lighting Software | Page 7

Rayfiles Online

http://catalog osram-os comhttp://catalog.osram-os.comClick on “Ray Files” icon

LED Fundamentals | Optical and Lighting Software | Page 8

Rayfiles Online

LED Fundamentals | Optical and Lighting Software | Page 9

What can Lighting Software do for me?Create any lighting scenario using OSRAM Opto Semiconductors LEDs as

Full software for calculating lighting layouts

y g g g pthe light sources or in a fixture.

– Create detailed interior and exterior illuminated scene models

– Create detailed lit renderingsCalculate lighting levels on all surfaces– Calculate lighting levels on all surfaces

LED Fundamentals | Optical and Lighting Software | Page 10

What are IES Files?

IES file Illumination Engineering Society Photometric data (intensity in candela vs angle) Photometric data (intensity in candela vs. angle) ASCII text file, file extension *.ies Commonly used in North America

Eulumdat file European version of the IES file File extension *.ldt

LED Fundamentals | Optical and Lighting Software | Page 11

How are IES Files Generated?

MMeasurement

Simulation

LED Fundamentals | Optical and Lighting Software | Page 12

IES files for IndividualIES files for Individual LEDs

LED Fundamentals | Optical and Lighting Software | Page 13

Thank you for your attention.Thank you for your attention.

LED Fundamentals | Optical and Lighting Software | Page 14

Disclaimer

All information contained in this document has been checked with the greatest care. OSRAM Opto Semiconductors GmbH can however, not be made liable for any damage that occurs in connection with the use of these contents.

OSRAM Opto Semiconductor GmbH makes no representations and warranties as to a possible interference with third parties' intellectual property rights in view of products

i i ti f f OSRAM O t S i d t G bH' t i i foriginating from one of OSRAM Opto Semiconductor GmbH's partners, or in view of products being a combination of an OSRAM Opto Semiconductor GmbH's product and a product of one of OSRAM Opto Semiconductor GmbH's partners. Furthermore, OSRAM Opto Semiconductors GmbH cannot be made liable for any damage that occurs in p y gconnection with the use of a product of one of OSRAM Opto Semiconductor GmbH's partners, or with the use of a combination of an OSRAM Opto Semiconductor GmbH's product and a product of one of OSRAM Opto Semiconductor GmbH's partners.

LED Fundamentals | Optical and Lighting Software | Page 15