Reflector design fortimo spot light module
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Reflector Design Fortimo Spot Light Module. GBU LED Lamps & Systems. April 2010. Contents. Reflectors for Accent Lighting Light mixing for Fortimo SLM Reflector design rules Optical interface Optical modeling using Ray Set files Examples of Reflectors for Fortimo Spot Light Module.

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Reflector Design Fortimo Spot Light Module

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Reflector design fortimo spot light module

Reflector DesignFortimo Spot Light Module

GBU LED Lamps & Systems

April 2010


Contents

Contents

  • Reflectors for Accent Lighting

  • Light mixing for Fortimo SLM

  • Reflector design rules

  • Optical interface

  • Optical modeling using Ray Set files

  • Examples of Reflectors for Fortimo Spot Light Module


Accent lighting luminaires

Accent Lighting luminaires

  • In accent lighting typically 3 beam widths are identified

    • Spot: 10 degree Full Width at Half Maximum

    • Medium:24 degree Full Width at Half Maximum

    • Flood:40 degree Full Width at Half Maximum

  • The light source dimensions determine the limits of the possible beam width – Law of Etendue – for certain max reflector diameters

  • With HID and Halogen smaller beams are possible due to the small source


Reflectors compact high intensity sources source indoor guide philips 2008

Reflectors compact high intensity sourcesSource indoor guide Philips 2008


Reflectors for fortimo slm versus dlm

Reflectors for Fortimo SLM versus DLM


Mixing the light

Mixing the light

  • Mixing the light is needed to reduce flux inhomogeneity and color variations between the individual LEDs

  • Options

    • Segmenting and faceting of reflector wall

    • 3D faceting

    • Structured reflector surface (ie diffuse)

  • Blurring / mixing widens the source:

    • Starting 12.8 mm of LED circle

    • After blurring 14 mm of source diameter


Diffusing the light

Diffusing the light

  • Diffusing the light is needed to fill the space between LEDs

    • Eliminates ring features in the beam

  • Highest efficiency is achieved when placed at the top

84%

94%

94%

Specular reflector without diffuser

Specular reflector with diffuser


Rings in the far field

http://www.bfioptilas.com/European+offices-3.htm

Rings in the far field

  • A diffusion foil or structured front glass is needed to eliminate rings in the far field projection (if desired).

  • Options:

    • Diffusion foil e.g. 5° diffusing foil of Luminit™

    • Structured glass

    • A transparent front glass with shading region at the outer edge

  • 1 and 2 slightly increase the beam width

BeNeLux - OfficeBFiOPTiLAS B.V(Chr.Huygensweg 17-2408AJ)P.O. Box 222 2400 AE Alphenaan den RijnPhone: +31 (0)172-44 60 60Fax: +31 (0)172-44 34 14E-mail: [email protected]

Anton Schotel

Rings in far field

Caused by direct rays


Accent factor punch

Accent factor / punch

  • The shape of the light distribution determines the punch

    • Gaussian shape is acceptable for most applications

  • Low height reflectors: more direct light, punch perception is reduced

    • FWHM ratio direct and reflected light should not be high

FWHM ratio direct/reflected light: 2.7

FWHM ratio direct/reflected light: 5.5

Large quantity of direct light,

large FWHM of direct light


Reflector design parameters

Reflector design parameters


Typical reflector design limits

Typical reflector design limits

(Source 1100 lm and 14mm)

  • Beam angle (FWHM) for certain reflector diameter is limited by law of Etendue, peak intensity is limited by reflector diameter and average source luminance

  • Using Gaussianbeam profile, an acceptable punch perception is achieved for the white shaded area

Typical minimal beam width for 1100 lm module is ~15o FWHM


Typical reflector design limits1

Typical reflector design limits

(Source 2000 lm and 20mm)

  • Beam angle (FWHM) for certain reflector diameter is limited by law of Etendue, peak intensity is limited by reflector diameter and average source luminance

  • Using Gaussianbeam profile, an acceptable punch perception is achieved for the white shaded area

Typical minimal beam width for 2000 lm module is ~20o FWHM


Light output ratio vs reflector dimensions

Light Output Ratio vs reflector dimensions

  • The reflector Light Output Ratio (LOR) or efficiency decreases for higher reflectors due more reflections at the reflector wall.

  • White shaded area depicts acceptable punch

  • No front glass taken into account

1100 lm

2000 lm


Typical reflector designs

Typical reflector designs

  • Table with typical reflector performances

    • Based on modeling, including mixing/diffusive impact, no front glass, Reflector R = 90%


Reflector technologies

Reflector technologies

  • Reflector technologies, price points, typical reflectivity

  • Final reflector efficiency (LOR) depends on reflector shape


Optical interface

Area for reflector mounting

Minimal distance of metallic reflector to electrical components is 1.2mm in open air, the cover ensures that this distance is met

Optical interface


Optical interface1

Optical interface

  • The surface available for reflector mounting is a ring with width:

    • 1100 lm: 7.3 mm

    • 2000 lm: 4.8 mm

Any 2000lm reflector will fit on the 1100lm module as well

y

x


Optical interface reflector attach

Optical interface reflector attach

  • Options for reflector attachment:

    • Mount to housing

    • Mount to heat sink

    • Glue to module

    • Using an additional bayonet on module

Option for reflector mounting with additional metal component


Ray sets 1100 2000 modules for reflector design

Ray Sets 1100/2000 modules for reflector design

  • Available formats for customer use

  • Measurement method

    • SIG 300, Radiant Imaging, flux measured is relative flux, including color


Fortimo slm 1100lm

Intensity polar plot

1100 & 200 Lm SLM

Fortimo SLM 1100lm

Alignment Image

Cross section of the CAD-model

  • The coordinate system of the ray set is identical to the coordinate system of the CAD-file: ‘Fortimo_LED_SLM_1100_18W-8xx_wk10.stp. If you import both the ray set and the CAD-file to the same location they are aligned.

  • To achieve this the following rotation and translation was performed:

    • Rotation about Z-axis: -1°

    • Translation along X-axis: 0.10mm

    • Translation along Y-axis: 0.01mm

    • Translation along Z-axis: -0.4mm (determined by defocus-analysis in LightTools)

  • The origin of the coordinate system is now in the center of the module at the height of the LED dies.

  • Part of the light is blocked by the module cover in the measurement. This part is missing in the ray sets (see cross section).

  • The rays start on a cylinder above the LEDs, so no rays start inside the geometry (radius = 9.4mm, 1.491mm < z < 1.5).


Fortimo slm 2000lm

Intensity polar plot

Fortimo SLM 2000lm

Alignment Image

Cross section of the CAD-model

  • The coordinate system of the ray set is identical to the coordinate system of the CAD-file: Fortimo_LED_SLM_2000_33W-8xx_wk10.stp. If you import both the ray set and the CAD-file to the same location they are aligned.

  • To achieve this the following translation was performed:

    • Translation along Y-axis: -0.1mm

    • Translation along Z-axis: -0.6mm (determined by defocus-analysis in LightTools)

  • The origin of the coordinate system is now in the center of the module at the height of the LED dies.

  • Part of the light is blocked by the module cover in the measurement. This part is missing in the ray sets (see cross section).

  • The field of view of the SIG300 is too small for the module. Therefore, part of the indirect light is missing in the ray sets (see alignment image).

  • The rays start on a cylinder above the LEDs, so no rays start inside the geometry (radius = 11.9mm, 1.491mm < z < 1.5).


Prototype results 1100 lm module sls reflector 5 diffuser foil from luminit tm

Prototype results 1100 lm module + SLS reflector 5° diffuser foilfromLuminitTM

Uniform spot, no rings

Reflector efficiency: 86 – 90%

Including POC foil: 82 – 85 %

Lineair scaling

Log scaling

Δu’v’ <0.008 for values larger than 5% of peak intensity


Prototype results 1100 lm module sls reflector 20 diffuser foil from luminit tm

Prototype results 1100 lm module + SLS reflector 20° diffuser foilfromLuminitTM

Uniform spot, no rings

Lineair scaling

Log scaling

Δu’v’ <0.008 for values larger than 5% of peak intensity


Prototype results 2000 lm module sls reflector 10 diffuser foil from luminit tm

Prototype results 2000 lm module + SLS reflector 10° diffuser foilfromLuminitTM

FWHM 26°

Reflector efficiency: 86 – 90%

Including POC foil: 82 – 84 %

Δu’v’ < 0.006 within 10% of peakintensity

Δu’v’ < 0.008 within 5% of peakintensity

Visual appearance(log2 visualisation)


Reflector supplier jordan

Reflector supplier Jordan

http://www.jordan-reflektoren.de

  • Jordan developed three reflector types that fit both 1100 and 2000 lm modules with a click-fit onto the module

  • Example beam profiles

1100 lm, 2 x 12.2O

2000 lm, 2 x 13.7O

Need diffusing exit window


Reflector supplier alux luxar

Reflector supplier Alux-Luxar

http://www.alux-luxar.de

  • AluxLuxar is developing a series of reflectors

    • Both pre-anodized (Miro) and post anodized

  • Example of Miro 8 based reflector for 1100 lm

    • Efficiency > 90%

No diffuser

1o diffuser

Reflector in combination with 5o diffuser gives a Gaussian beam, FWHM < 15°.

5o diffuser

Efficiency: -3%

/ 1100 lm


Contact addresses

Contact addresses:


Convergent beams cross over reflector

Convergent beams - cross over reflector

  • By combining the Fortimo SLM module and a convergent reflector, a system with an aperture can be designed

  • The efficiency of the system is limited by the Law of Etendue

  • Example for an aperture  30 mm and desired FWHM = 2x12o :

    • 2000 lm module with  20 mm efficiency: 11%

    • 1100 lm module with  14mm efficiency: 20%

    • With a hypothetical source of  6.5 mm:

      efficiency: 100%

1100 lm module


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