8/30/2006 1
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
LED Luminaire with Controlled Light Distribution
Donald J. Schertler, Stephen Chakmakjian,Tasso R. M. Sales, G. Michael Morris
RPC Photonics, Inc.www.RPCphotonics.com
2 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Solid State Lightingg Finding greater use in commercial and residential
applications4High Brightness4 Small Size4 Efficiency
g Light Control4High Brightness LEDs are Lambertian4Collimation tends to add structure to the light4Add a diffusion element
0 Ground glass, mixing rod, holographic diffuser
3 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Controlled Light Distribution
gEngineered Diffuser™ redistributes the collimated LED light into any desired pattern
4 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Collimator Design
gThe collimator has four surfaces that perfectly collimate a point source at the origin
D
L
d
H
Paraboloid
Hyperbolic Lens
Sphere
5 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Collimator Performance
gExample: D = 5mm, H = 10mm, n = 1.5, 1mm2 LED
Spatial Distribution Angular Distribution
6 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Collimator Performance
8.53.711.25
631510
4.42.320.620
2.7°1.7mm28.7mm40mm
FWHMdLH
gExample: D = 5mm, n = 1.5, 1mm2 LED
7 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Diffuser-Collimator Combinations
gThe Engineered Diffuser™ can be formed directly on the collimator or as a separate component placed above the collimator
8 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Resist Coat
Diffuser Fabrication – Laserwriting Process
I(x,y)
I
x
Substrate
Intensity Conversion
D/AModulator
Laser Intensity I
Stage Control (x,y)
Resist Profile after Development
Bit map
9 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Engineered Diffusers™• Refractive, microlens structure
• Each microlens is individually designed
• Microlens parameters are randomized to eliminate repetitive artifacts and interference effects
• Control of scatter distribution and intensity profiles
• Insensitive to wavelength
•Compatible with high volume molding and replication processes
10 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Engineered Diffuser™ Examples
Rectangle Square
Annulus
11 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Luminaire Example
gOSRAM Golden DRAGON® Green LED4Flux of 35 lm at 500 mA4Efficiency of 20 lm/W4Lambertian emitter
12 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Collimation Performance of the LEDLED Divergence from Collimator
0
100
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700
-20 -15 -10 -5 0 5 10 15 20
Scatter Angle
Rel
ativ
e In
tens
ity
HorizontalVertical
13 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Flat-top Diffuser with Laser Engineered Diffuser with Laser Illumination
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0.5
1
1.5
2
2.5
3
3.5
4
-30 -20 -10 0 10 20 30
Scatter Angle
Rel
ativ
e In
tens
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HorizontalVertical
14 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Flat-top Diffuser with LED Engineered Diffuser with Collimated LED Illumination
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-40 -30 -20 -10 0 10 20 30 40
Scatter Angle
Rel
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e In
tens
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HorizontalVertical
15 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Diffuser Engineered for the LEDEngineered Diffuser with Laser Illumination
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
-45 -30 -15 0 15 30 45
Scatter Angle
Rel
ativ
e In
tens
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HorizontalVertical
16 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
LED and Collimator with Engineered Diffuser
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30
35
-45 -30 -15 0 15 30 45
Scatter Angle
Rel
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tens
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HorizontalVertical
Engineered Diffuser™ with LED
17 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Luminaire Configurations
gOne- and two-dimensional arrays of LEDs
18 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Summary
gHigh brightness LED luminaire with controlled light distribution.
gCustom scatter distributions – round, square, rectangular, dipole, etc.
gCustom scatter profiles – flat top, Gaussian, bowl-shaped, etc.
gLow profile lighting fixturegSingle, 1-D and 2-D LED arrays