Designing with Tertiary Optics

in Mind

Suleyman Turgut

Luminit

2

LED Optics Terminology

Examples of Designs

Design Concept: “Collimate then Diffuse”

Benefits

Formats

Holographic Diffusers

Modeling Tools

Agenda

3

Primary Optic – ball lens on LED (90-110º)

Secondary Optic – TIR or Reflector (5-15º)

Tertiary Optic – Diffusers (5-80º)

Terminology

4

Primary Optic

Secondary Optic

Internal Reflector

Fresnel Lens

Tertiary Optic

Example: PAR38

5

Primary Optic

Secondary Optic

Internal Reflector

Tertiary Optic

Example: Recessed Down Light

6

• Bare LED Radiation Pattern

– Directional but still very wide, 90-110º beam angle

– Not useful or efficient if your “throw” is > 0.5 meter

• Secondary Optics

– Collimates the beam angle to 5-15º

• Tertiary Optics

– Expands the beam to the required beam angle and shape

“Collimate then Diffuse”

7

• Single Optical System Design

– No need to redesign secondary optical system if the project/product

requires a different beam angle

• Reduced Total Cost and Faster Time to Market

– Single mold cost for secondary optic

– Fewer SKUs

• Flexibility

– Same fixture can address different projects

– Diffuser accessory can allow the beam angle to be changed in the field

• Cleaner Target Plane

– Reduced hot spots, better color uniformity, reduced multiple shadows

Benefits of “Collimate then Diffuse”

Example: Single Optical System Design

Example: Single Optical System Design

Example: Single Optical System Design

Example: Reduced Total Cost

Required: 3 Different Angles

• 3 Optical Designs

• 3 Molds

• 3 SKUs

• Larger Inventory

• 1 Optical Design

• 1 Mold

• 1 SKU

• 3 Accessory Lenses

Example: Cleaner Target Plane

Example: Cleaner Target Plane

Example: Cleaner Target Plane

15

Tertiary Optics: Formats and Options

Thin Films Substrate: 0.25mm thick PC

Sheets or Rolls up to 20” Wide

Cut parts

Strip Rolls 250 feet long

Thick Substrates Substrate: 3mm thick PC

UV stable (non-yellowing)

Up to 20x40” sizes

Injection Molded Substrate: UL flame rated

800

Surface Relief vs. Bulk Diffusers

• Surface Relief Pattern High transmission efficiency:

~92%

Optical performance is

independent of thickness of

substrate

• Random Size Distribution Ensures uniform optical

performance over all

wavelengths/colors

• BTDF data available on our website

• Surface Diffusers can be modeled in:

• Photopia (http://www.ltioptics.com)

• LightTools (http://www.opticalres.com)

• TracePro, Optis and Zemax

Modeling/Simulation

Thank you.