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Concept

Lux

Related publications (17)

A smart luminaire in an office environment: impact on light distribution, user interactions and comfort

Jérôme Henri Kämpf

A smart luminaire able to change the direction of its light beam is installed in an office environment and compared to the available LEDs fixtures. Standard lighting measures are performed and a controlled user experiment is conducted, involving 22 subject ...

IOP Publishing Ltd2019

Cognitive performance evaluation under controlled daylight levels at different indoor temperatures

Marilyne Andersen, Jan Wienold, Giorgia Chinazzo

This paper details the results of an experimental study investigating the influence of daylight illuminance levels and indoor temperatures on objective and subjective performance evaluations, investigated through paper-based tasks and questionnaires, respe ...

2019

Influence of indoor temperature and daylight illuminance on visual perception

Marilyne Andersen, Jan Wienold, Giorgia Chinazzo

This paper details the results of an experimental study investigating the combined effect of indoor temperature (19 ℃, 23 ℃ and 27 ℃) and horizontal illuminances (∼140 lx, ∼610 lx and ∼1440 lx) on visual perception, with daylight as the only source of ligh ...

2019

Tailoring Triple-Anion Perovskite Material for Indoor Light Harvesting with Restrained Halide Segregation and Record High Efficiency Beyond 36%

Hong Zhang, Zhiwen Zhou

Indoor photovoltaics are promising to enable self-powered electronic devices for the Internet of Things. Here, reported is a triple-anion CH3NH3PbI2-xBrClx perovskite film, of which the bandgap is specially designed for indoor light harvesting to achieve a ...

2019

A Critical Literature Review of Spatio-temporal Simulation Methods for Daylight Glare Assessment

Marilyne Andersen, Jan Wienold, Stephen William Wasilewski

A well daylighted space can provide a highly satisfying visual environment. However, if that environment causes us visual discomfort, it can become such a nuisance that we, sometimes literally, turn our backs on this powerful connection to the outside worl ...

2019

Shaping light to influence occupants’ experience of space: a kinetic shading system with composite materials

Marilyne Andersen, Anastasios Vassilopoulos, Jan Wienold, Kynthia Chamilothori, Joëlle Baehr-Bruyère

Adaptive kinetic façades are systems capable of modifying their shape to optimize their behavior regarding real time outdoor and indoor conditions. They are typically evaluated based on quantifiable physical parameters such as illuminance levels, with litt ...

IOP Publishing2019

Daylight affects human thermal perception

Marilyne Andersen, Jan Wienold, Giorgia Chinazzo

Understanding the factors that affect human thermal responses is necessary to properly design and operate low-energy buildings. It has been suggested that factors not related to the thermal environment can affect thermal responses of occupants, but these f ...

Nature Research2019

A field study investigation on the influence of light level on subjective thermal perception in different seasons

Marilyne Andersen, Jan Wienold, Giorgia Chinazzo, Luisa Pastore

This paper evaluates the influence of light levels (i.e., illuminance) on subjective thermal perception of people, distinguishing between thermal sensation and thermal evaluation. The goal is to investigate whether reported effects found by other studies i ...

NCEUB 20182018

Toward proper evaluation of light dose in indoor office environment by frontal lux meter

Jean-Louis Scartezzini, Ali Motamed, Maira Vieira Dias

The wearable Brazilian illuminance meter “OcuLux” provides the opportunity to monitor continuously pupilar illuminance for indoor environment. The device is calibrated to evaluate the illuminance in lux for the range of 0 to 3500 lux with 23% of precision. ...

Elsevier2017

Sensitivity analysis of visual and thermal parameters for energy savings: combining illuminance and temperature set-points for possible trade-offs

Marilyne Andersen, Jan Wienold, Giorgia Chinazzo, Joshua Pereira, Mathieu Plourde

This study presents a methodology for evaluating the effects of simultaneous temperature and illuminance set-point variations on energy consumption. Different illuminance levels are achieved with an innovative dynamic shading control algorithm that allows ...

2017

Occupants interaction with electric lighting and shading systems in real single-occupied offices: Results from a monitoring campaign

Marilyne Andersen

This study presents the results of a monitoring campaign aiming to further our understanding of occupants' behavior regarding the manual control of electric lighting in combination with shading control. It was performed on eight single-occupied offices in ...

Elsevier2013

Comprehensive Annual Daylight Design through a Goal-Based Approach

Marilyne Andersen

Decisions affecting building form and orientation and choices regarding opening size, type and positioning have a great effect on the building’s access to daylight and are typically made during the earliest stages of architectural design. Computer simulati ...

2012

Daylighting Metrics: Is there a relation between Useful Daylight Illuminance and Daylight Glare Probabilty?

Marilyne Andersen, Nicolas Roy

The establishment of climate-based daylight modeling within research and practice has led to a fundamental reassessment of both the basis and purpose of daylight metrics. Whilst there is no consensus yet on the precise nature of the metric(s) that should r ...

2012

Electron beam characterization of a combined diode rf electron gun

Christoph Peter Hauri, Stefan Yves Gabriel Binder, Rasmus Ischebeck

Experimental and simulation results of an electron gun test facility, based on pulsed diode acceleration followed by a two-cell rf cavity at 1.5 GHz, are presented here. The main features of this diode-rf combination are: a high peak gradient in the diode ...

American Physical Society2010

A fast daylight model suitable for embedded controllers

This paper describes a fast daylight model suitable or embedded daylight controllers. For a given room geometry (including position and tilt of venetian blinds, and the sun's position), the indoor illuminances are modeled as a linear combination of outdoor ...

2009

Bayesian estimation of visual discomfort

Nicolas Morel

A method is proposed to estimate objectively occupants' visual discomfort in small office rooms as a function of the illuminance at one or more locations. Expressed as a visual discomfort probability, it is based on an analysis of the past history of the u ...

2008

Doping-induced charge trapping in organic light-emitting devices

Frank Nüesch, Libero Zuppiroli, Detlef Berner, Michel Schär

By using pyran-containing donor-acceptor dyes as doping molecules in organic light-emitting devices (OLEDs), we scrutinize the effects of charge trapping and polarization induced by the guest molecules in the electro-active host material. Laser dyes 4-(dic ...

Wiley-VCH2005