16/11/2010 1

TracePro Evaluation“TracePro, renowned in the scientific community for the accuracy of its simulations, offers lighting designers the confidence that the performance and aesthetics of finished products will concur with the simulated design without costly prototype iterations.”

Lambda Research Corporation specialise in software

tools for optics and illumination designers – TracePro

is one of their offerings

Is there a use for TracePro within F&P?

When a reflector is not quite what it should be

16/11/2010 2

Potential usage within PD

Lighting and optical design areas for appliances

– Light sources

– Light pipes– Reflectors

– Diffusers

– Materials

Specifics • Cavity lighting

– Oven/Fridge/Drawer• Optimisation of load

illumination

• Optimisation of light source requirements

• Minimization of shadows and silhouettes

• Elimination of glare

• Elimination of costly prototyping iterations

• User interfaces– Bezels/masks/point

illumination• Optimisation of hot

spots, colour mixing, spill, shielding, source selection

OB90 simulation of single cavity light

Mixing of RGB LED light sourcesWhite result starting to appear – limited in this simulation by numbers of rays traced

16/11/2010 3

Touch switch bezel

• System modelling

– Direct import of ProE

bezel model

– Applied material

properties to bezel

(Polycarb)

– Applied diffusion

properties to exit surfaces

– Insert a target

absorption surface for

exit ray capture

– Model cap button insert

– Model sheet surface

surround for bezel

– Model LED source

• Wavelengths

• Exit surfaces

• Rays to simulate

Target surfaces in purple

Two LED sources for comparison

Auxiliary LED source – rays simulated that reach target surfaces 4395

Projected image on external surface. Pipe efficiency with Primary LED source ~3%

Projected image on external surface. Pipe efficiency with Aux LED source ~25%

Actual Bezel in operation – notice the hot-spots and dark ring

Primary LED source – rays simulated that reach target surfaces 664

16/11/2010 4

Tack switch bezel

• System modelling involves very similar process

• Once the system is modelled variations to the bezel model can be rapidly analyzed until an optimum solution is realised

• Each halo illustrated is a projection from the exit surfaces of the bezel to a target screen 1mm away

16/11/2010 5

GOEP light pipe

• OB90 function and temperature control lighting bezel model

• LED models available within the TraceProenvironment

• Pipe simulated

– Efficiency ~60%

• Illustrations represent only 25k simulated rays

– Shows a uniform distribution about the

target bezel surface

16/11/2010 6

Orientation of a bulb

• Does the orientation of a halogen bulb effect the illumination efficiency of a target?

• Dummy target modelled as a perfect absorber to avoid unwanted reflection

• Housing unit modelled with ANOFOL material surface – close approximation to aluminised steel

• Change in bulb orientation improves efficiency by 73%

– Capable of further increased efficiency by changing perpendicular alignment of filaments

16/11/2010 7

Reflector material

• TracePro contains a library of surface materials that can be applied

• Simple system created to demonstrate affect on efficiency with various materials

– The model is based on a

possible configuration of

a lighting unit for an oven cavity

– Only one bulb position

simulated

– Efficiency measured by

rays captured at a target surface as a percentage

of total rays simulated

38% 44% 56% 83%

16/11/2010 8

OB2 cavity lighting • Goal

– Locate the optimum bulb

locations to effectively

illuminate a central cavity load as viewed

from an external screen

– Simulations only capture

rays that are direct reflections from the

cavity load

– Internal walls of cavity

are modelled as perfect

absorbers

– From previous known

cavity studies 9 target

bulb positions have been simulated

– Positions 3, 4, 5, and 6

give a worst case

efficiency improvement of 35%

Current acceptable position as in OB90 Bulb position 1 to 4 gives 93% efficiency improvement

16/11/2010 9

OB2 cavity lighting• Goal

– Using previous results:• Bulb orientation

• Reflector material

• Bulb locations

– Meet lighting CI’s including illumination of multiple cavity

loads

– System modelling completed as in all previous exercises

– To achieve the optimum light housing position along the Z axis

the loads have been moved in successive simulations to

determine the point of maximum

efficiency

– Assuming the cavity load would

be central on the Z and X planes the lighting units optimal location

is 40mm forward of centre

– An OB90 style lighting system would provide zero illumination

of the lower shelf load in a dual load configuration

Bulb and housing

vertical positioning

selected to ensure

acceptable

illumination of worst

case dual loads

within cavity

Trays have been

modelled as perfect

absorbers

Loads are reflectors

Cavity walls

absorbers

Captured rays are

only those reflected

from loads