LED Luminaire with Controlled Light Distribution · 2 LED Luminaire with Controlled Light...

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


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



Controlled Light Distribution

gEngineered Diffuser™ redistributes the collimated LED light into any desired pattern



Collimator Design

gThe collimator has four surfaces that perfectly collimate a point source at the origin

D

L

d

H

Paraboloid

Hyperbolic Lens

Sphere



Collimator Performance

gExample: D = 5mm, H = 10mm, n = 1.5, 1mm2 LED

Spatial Distribution Angular Distribution



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



Diffuser-Collimator Combinations

gThe Engineered Diffuser™ can be formed directly on the collimator or as a separate component placed above the collimator



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



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



Engineered Diffuser™ Examples

Rectangle Square

Annulus



Luminaire Example

gOSRAM Golden DRAGON® Green LED4Flux of 35 lm at 500 mA4Efficiency of 20 lm/W4Lambertian emitter



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



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



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



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



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



Luminaire Configurations

gOne- and two-dimensional arrays of LEDs



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

LED Luminaire with Controlled Light Distribution · 2 LED Luminaire with Controlled Light...

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