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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
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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
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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
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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
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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
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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
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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
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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
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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
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10 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
Engineered Diffuser™ Examples
Rectangle Square
Annulus
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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
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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
200
300
400
500
600
700
-20 -15 -10 -5 0 5 10 15 20
Scatter Angle
Rel
ativ
e In
tens
ity
HorizontalVertical
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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
0
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
ity
HorizontalVertical
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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
0
10
20
30
40
50
60
70
80
-40 -30 -20 -10 0 10 20 30 40
Scatter Angle
Rel
ativ
e In
tens
ity
HorizontalVertical
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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
ity
HorizontalVertical
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16 LED Luminaire with Controlled Light Distribution
Presented at the SPIE 2006 Annual MeetingSan Diego, CA
LED and Collimator with Engineered Diffuser
0
5
10
15
20
25
30
35
-45 -30 -15 0 15 30 45
Scatter Angle
Rel
ativ
e In
tens
ity
HorizontalVertical
Engineered Diffuser™ with LED
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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
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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