Philippe Perrin

Astronaut Colonel, French Air Force, France

Earth’s Lights seen from the space – The Astronaut’s impression & thoughts

 “There is a place where days are 90 minutes long. A place where on a bright sunny day, sky is pitch dark… And where shooting stars are zipping bellow your feet…”

 Astronaut Philippe Perrin who flew on STS111 where he performed 3 spacewalks, in low earth orbit, will enlighten us with his perspective on earth, taking light as a guiding thread through a 10 minutes stroll in outer space.

David H. Sliney, Ph.D.

Johns Hopkins University Bloomberg School of Public Health, USA

Determining Actual Retinal Exposures to Ambient Light

With the discovery of the photosensitive retinal ganglion cells, much of the effort to asses retinal exposure has related to the most relevant spectral functions, and this was also the emphasis in CIE Standard, S-026:2018, “System for Metrology of Optical Radiation for ipRGC-Influenced Responses to Light.”  Since the head is normally upright, many have suggested measuring vertical (rather than horizontal) illuminance (lux) and have now focused on spectrally adjusted illuminance:  equivalent melanopic lux (EML) or melanopic equivalent daylight illuminance (EDI or m-EDI). However, these adjusted illuminance measures focus only on spectral, and not the spatial aspects, of exposure.  CIE S-026:2018 also notes that the field-of-view of the subject observer significantly affects the actual retinal exposure. It is therefore important to recognize the of retinal exposure which is proportional to scene luminance. The human visual field is very limited vertically and the eyes are actually aimed downward in most settings.  Measurements of spectral reflectance strongly affect retinal spectral exposure and can vary greatly from overhead luminaires. A measure of ambient illumination for the purpose of evaluating both visual and non-visual effects in a given environment really should apply field-averaged luminance (cd·m^-2).

Prof. Robert F. Karlicek,

Rensselaer Polytechnic Institute, USA

Advanced adaptive smart lighting systems

Historically, lighting and lighting control systems have always been about saving energy while providing the right kind of illumination where and when it was needed for any type of human activity. Now that solid state lighting based on spectrally tuneable, highly efficient LED technologies has pulled the lighting industry into the electronic era, lighting system design and operation can take advantage of rapidly evolving technologies like smart sensing, machine learning and artificially intelligent control systems. This talk will describe our research at the intersection of advanced LED lighting technology and artificially intelligent control systems to create autonomously controlled illumination platforms, where the lighting system itself seeks to become an electronic lighting designer, dynamically and automatically providing the right light where and when it is needed without active human control.

Kevin Lane, PhD

International Energy Agency

Kevin is a Senior Programme manager at the International Energy Agency, where he oversees the analytical work of the IEA’s Energy Efficiency Division. 

He has almost 30 years of experience working with different governments to develop, implement and evaluate policy and programmes to increase energy efficiency, with a special focus on appliances and lighting.

He has a PhD in statistics and climatology, with postdoctoral research into energy efficiency at the University of Oxford.

Prof. Erik Runkle

The science and practice of horticultural lighting

 While there are some similarities, there are meaningful differences in how plants and people perceive and respond to light. First, we characterize the light environment for plants based on its photon flux density (instantaneously or cumulatively), photon spectrum, and duration of light and darkness each day. These light dimensions influence various plant growth, morphological, and flowering responses, which can vary from one crop to another. Second, there are three primary lighting applications in horticulture: a low-photon flux density at night to create artificial long days (photoperiodic lighting); a moderate-photon flux density to supplement light available to plants inside a greenhouse (supplemental lighting); and a high photon-flux density inside closed environments, without sunlight (sole-source lighting). Horticultural lighting fixtures are usually designed for one of these three lighting applications and therefore, the photon flux and spectrum vary widely from one commercial fixture to another. Solid-state lighting enables the engineering of plant lighting fixtures for these applications while also consuming less energy than conventional fixtures.

Niels Ladefoged

European Commission (DG ENER)

Team Leader - Product Efficiency (Ecodesign and Energy Labelling) European Commission

DG Energy (energy efficiency: 2014-2020)

Cabinet of 1st EU Commissioner for Climate Action (2010-2014)

DG Energy (renewable energy: 2008-2010)

DG Environment (environmental/climate aspects of transport policy, aviation – 2001-2008)

Danish Energy Agency (1997-2001)

Demand side management and renewables policies

Dr. Christophe Martinsons

CSTB Centre Scientifique et Technique du Bâtiment, France

 Contemporary issues with temporal light modulation of lighting systems

Temporal light modulation (TLM) is defined as a temporal change in luminous or colour quantities of a light source, resulting from an unsteady power supply. Research studies published during the past decade helped define new metrics describing well-known visual effects of TLM such as direct flicker and the stroboscopic effect. Other acute visual artifacts induced by TLM such as colour breakup and the phantom array effect are still under investigation by several teams of researchers aiming to better understand their occurrence and visibility, especially when viewing modern types of LED modules and power supplies, used for instance in automotive lighting and in colour-tuneable decorative or entertainment lighting. Health effects associated with the exposure to TLM were initially revealed by research carried out using fluorescent tubes from the 1960s up to the 1990s. With the advent of solid-state lighting, high levels of temporal light modulation and new types of waveforms exhibited by some LED lamps and luminaires have generated concerns among users and regulators, thereby motivating new research efforts to elucidate their impacts on humans. This talk will review the existing knowledge and the pending research questions about the temporal light modulation of lighting systems and its effects on humans

Prof. Ryotaro Ozaki,

Ehime University, Japan

 Photoluminescence Enhancement of organic dye in thin film by metal layer and electrospun nanofibers

 Nanofiber is a nanostructured material whose diameter is several tens to several hundreds of nanometres. Electrospinning is widely used for manufacturing nanofibers, wherein fibres are formed by filling a syringe with a polymer solution and applying a high voltage to the needle tip. One-dimensionally aligned or randomly aligned nanofibers can be easily obtained by changing collector electrodes in electrospinning setup. In this study, we demonstrate photoluminescence enhancement of dye-doped polymer films using metal layer and electrospun nanofibers. Enhanced emissions from the polymer films on a planar aluminium layer have been observed which can be explained by interference. The photoluminescence intensity of the sample also gradually increases during nanofiber electrospinning. The emission enhancement by nanofibers is brought about by improving the excitation efficiency and light extraction caused by light scattering.

David H. Sliney, Ph.D.

Johns Hopkins University Bloomberg School of Public Health, USA

Germicidal Ultraviolet and New Exposure Limits for UV-C in the US

The application of ultraviolet germicidal irradiation (UVGI) to combat infectious disease transmission dates back more than a century and it was widely used in hospitals and public venues to reduce infections by inactivating airborne parthenogens in the 1930s – 1950s.  Studies from those times demonstrated efficacy, but UVGI lost favor in the 1960s after vaccines against a number of childhood diseases, such as polio and measles had been virtually eliminated.  Recently with the COVID-19 pandemic, the lessons learned in the past few decades only from TB control have permitted a ‘rediscovery’ of this effective technology.  Sadly, misconceptions about a perceived skin cancer risk and a lack of understanding of proper safety precautions continue to slow the wide acceptance of UVGI.  Furthermore, the pandemic has greatly accelerated development of UV-C LEDs and other lamp types such as the krypton-chloride (222-nm) lamp to augment the traditional use of low-pressure mercury (254 nm) lamp.  The development of short-wavelength UV-C sources also accelerated a review and relaxation of UV-C exposure limits in the US.

Dr. Jonas Tirén

CTO and Vice President, LightLab, Sweden

Field emission-based chip-scale UV-C technology: Design, characteristics and disinfection performance

A chip-scale field emission based UVC technology for disinfection of water air and surfaces has been developed. The device is based on a nanostructured field emitting cathode and an optimized cathodoluminescent material. The design of the UVC devices and design tradeoffs are discussed, with respect to vacuum, dielectric, and thermal properties. Results from electrical parametrical measurements and thermal stability are discussed. Optical measurements and temperature dependence over -20°C to + 120°C are presented. The resulting devices offer an effective broad band UVC and UVB spectrum with negligible dependence on ambient temperature without any need for thermal management. Tests on Escherichia coli show excellent disinfection properties, we have for example demonstrated a germicidal reduction by a factor > 10⁸ (”log 8”). Our results also indicate that the optical spectrum prevents re-activation of bacteria. Germicidal results from several other pathogens are also presented, including SARS-Cov-2.

Peter E. Gordon

International Ultraviolet Association, USA

Stamped Metallic Optical Reflectors (MOR) enhanced Ultraviolet Light Emitting Diodes applied to upper room air and POU water treatment reactors

Application of UVC LED technology is now an established method for effective inactivation of pathogenic bacteria, viruses, and spores that are aerosolized and airborne, residing in moving or reservoirs of fluids, and or settled on high touch surfaces. However, germicidal light emitted from UVC LEDs disperses rapidly over a large emission angle undermining solution efficiency. Historically, a lens has been used to slightly narrow the beam, but polymer lenses degrade quickly when exposed to UVC optical radiation and it is difficult to achieve 20 degree or smaller FWHM for far field irradiance with quartz lens requiring secondary optics for further beam shaping. The output beam profile and optical performance of this new MOR technique was measured by National Institute of Standards and Technologies and the results demonstrate excellent correlation. MORs demonstrate highly efficient means to create irradiance contours able to overcome optical radiation attenuation and divergence in air and water treatment applications.

J. Norman Bardsley, PhD,

CEO Bardsley Consulting, USA

Solid State Lighting - a Transformation Still in Progress

 Despite the clear advantages in efficiency, colour tunability and lifetime, solid state lighting has still not completed the revolution in lighting that might be enabled by the technology.  Though chips with efficacy over 220 lm/W are available, the efficacy of many solid- state lighting fixtures is still less than 100 lm/W.  Thus, the promised major savings in global electricity consumption remain to be achieved.  The form factor of most lighting fixtures has changed little.  The small size of inorganic LEDs exacerbates problems of glare, so that the source must be hidden behind shades or diffusers. OLEDs have yet to deliver the anticipated benefits of conformable diffuse light sources. Nevertheless, the spectral control offered by SSL is opening up new opportunities to enhance the impact of artificial light on all facets of the health and well-being of humans and the planet.  These span both the visual and non-visual effects of light. Examples such as deep-UV, agriculture and automobile lighting will be used to help assess the progress in these applications.

Peter Bennich

The Swedish Energy Agency

Dynamics of the smart home market: Opportunity or challenge for 2022?

In this presentation, the ideas and design for a new domestic end-use measurement campaign in Sweden will be presented. Like the previous study, done in 2005 – 2008, detailed measurements on the appliance level in a representative number of households will be performed. As last time, the measurements will also be accompanied with behavioral studies, to explain the user patterns more in detail. The results will be used to update the statistics of the household electricity, to evaluate the product policies in EU such as the ecodesign and energy labeling, to detect new trends in the stock and user patterns, to assess the remaining energy saving potentials, and to assess the potential for households participating in flexibility markets

Doug Johnson

Consumer Technology Association (CTA), USA

Energy efficiency and the consumer technology industry:  Three lessons and a strategy

Norbert Herzog

Global Strategic Insight, GfK SE

Impact of new EU energy label: Market overhaul and a new reality of opportunities

The new EU energy label was launched at a time when sustainability was reaching completely new levels of relevance in the minds of consumers. Hence, a wealth of opportunities has evolved, be it new potential to differentiate to other brands or new upselling prospects.

In addition, large parts of the assortment were overhauled and this leads to the “youngest” assortment seen in a long time, with noticeable effects on average prices.

This talk will shed some light on how consumers reacted in their purchasing behavior to the new offerings/labels by looking at European, sales weighted insights regarding the affected MDA categories as well as TVs. 
Besides looking at the stunning differences between categories and segments, the session will give an outlook on where the market is heading in 2022 and will touch on key energy saving potentials still to be exploited.