LampMateTM: A Highly Reflective Nano-Optical Coating for the Lighting

Industry

Vincent Lai Executive Director World Tech Incorporation Limited

Dr. Tin Lau Project Leader Nano and Advanced Materials Institute Limited (NAMI)

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Hong Kong – Pearl of the Orient

Source: Wikipedia

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A Closer look…

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A Closer look…

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The Consequences…

Source: SCMP Photo: Bloomberg Source: Internet

Source: CLP

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Innovation Takes Place in Our

Daily Life

James Dyson:

As an engineer I'm constantly spotting

problems and plotting how to solve them.

You don't get inspiration sitting at a

drawing board or in front of your

computer.

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World Tech Incorporation Limited

World Tech Incorporation Limited (WTI) is an environmental technologies company located in Hong Kong. We support sustainable development and we develop affordable green materials and technologies to improve people's quality of life.

WTI is formed by a group of professional with extensive experience in green technologies, environmental management, building engineering, IT, and business management.

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The Desired Coating

Environmentally friendly

High Total Reflectance

High Diffuse Reflectance

Enable Indirect Lighting Fixture Design

Resistant to heat/UV/water/…

UV Absorption

Low Cost

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A Collaboration between Industry

and Research Institute

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Global Concern of Eco-Friendliness

• Increasing concern on environmental protection and energy shortage in current society

• Important to develop product that is environmental-friendly and can help saving energy

10 Source : phxnews.com

Limitations of Traditional Reflective

Lighting Fixture Material

• e.g. Aluminium reflector (Mirror-like surface)

• High specular reflection but Low Diffuse Reflection

• Small Angle of Reflection

• Uneven light intensity in different area and decreased efficiency of reflection

• Significant portion of energy is wasted

• Light pollution may be caused

• Obvious glare (眩光) also cause discomfort to human eyes

Source : osapublishing.org 11

Environmental Unfriendly and Expensive Process of

Traditional Reflective Lighting Fixture Material

• Environmental unfriendly process (e.g. Electroplating system)

• Consume large amount of electricity

• Produce toxic/Harmful chemical wastes

• Tighter restrictions on waste emissions in many countries (esp. Mainland) (i.e. High post-treatment cost)

• Expensive facilities (e.g. Physical Vapor Deposition (PVD) system)

• High production cost

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Source:

watertecllc.com

chrometech.com.au

vintage-headlamp-restoration.co.uk

What is LampMateTM Diffuse Coating?

• High total reflectance and diffuse reflectance

• Large Angle of Reflection

• Uniform light intensity to all directions and high reflection efficiency

• Good resistance to various environments low cost (Easier maintenance)

• Environmental friendly material (Water-based)

• Environmental friendly fabrication process (No harmful waste)

13 Source : osapublishing.org

What are the Benefits to Apply LampMateTM

Diffuse Coating on Lighting Industry?

• Specular Reflection V.S. Diffuse Reflection

• Glare is minimized when LampMateTM diffuse coating is used

Source : math.hws.edu 14

Why Nanomaterial Can Enhance Diffuse Reflection?

• Nano-size pigment is used

• Strong diffraction of incident light

• Efficient reflective light scattering can be achieved

Source: DuPont Diffraction of Light Around Particles with Different Sizes

Incident light Incident light

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Better Lighting Reflectance of LampMateTM

Diffuse Coating

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Robust Properties of LampMateTM Diffuse

Coating for Application of Lighting Industry

Performance Test LampMateTM Diffuse Coating

Total reflectance ≥90%

Adhesion 4B to 5B

Aging (UV resistance) No peeling, bubble and visible color change after 72 hrs

Heat resistance 150oC

Chemical

resistance

Acid solution No peeling, bubble and visible color change after 24 hrs

Alkali solution No peeling, bubble and visible color change after 24 hrs

Acetone (100%) No peeling, bubble and visible color change after 24 hrs

Ethanol (100%) No peeling, bubble and visible color change after 24 hrs

Ethanol (75%) No peeling, bubble and visible color change after 24 hrs

Detergent solution (5%) No peeling, bubble and visible color change after 24 hrs

Water resistance No peeling, bubble and visible color change after 24 hrs

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Challenges of Developing

LampMateTM Diffuse Coating

Trade-off &

Optimization

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(e.g. Anti-aging, Chemical

resistance, etc)

NAMI’s Know-How Facilitates Development of

LampMateTM Diffuse Coating

• Optimization of Formulation • Screening and selection of most suitable

pigment, binder, and additives, etc.

• Optimizing of compositions of components

• Optimization of Process Method • Screening and selection of most suitable

process steps (e.g. dispersing method)

• Optimizing the conditions of each process step (e.g. dispersing speed and time)

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Potential Applications

LampMateTM can be used in office, industrial area, residential area, public transportation such as MTR station, and outdoor environment.

It can be applied to various types of lighting fixtures including High Bay Lighting, Ceiling Panel Light, Down Light, Advertisement Panel, Functional Lights, etc. with various types of light sources including LED, Fluorescent Tube, etc.

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