Search results for "LED lamp"

showing 10 items of 12 documents

Energy savings for indoor lighting in a shopping mall: A case of study

2018

The paper presents an application of energy saving in the final users. In particular, the case of study evaluates the energy consumptions of a big shopping mall, located in the middle part of Italy, illuminated by fluorescent lamps. In order to reduce the energy demand, the case of study shows a first solution based on LED lamps; a second step considers the adding of a building automation system, maximizing the energy saving, thanks lighting sensors that module the luminous flux taking in count of natural lighting through skylights.

Architectural engineeringEnergy demandComputer sciencebusiness.industryRenewable Energy Sustainability and the Environment020209 energyShopping mallLEDComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION02 engineering and technologyEnergy consumptionlaw.inventionLuminous fluxLED lampBuilding automation systemlawOrder (business)energy savingAutomotive Engineering0202 electrical engineering electronic engineering information engineeringbusinessEnergy (signal processing)Building automation
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Improvement of Energy Efficiency for Indoor Lighting in a Big Shopping Center

2018

As the progressive diffusion of shopping centers in Italy, the paper analysis the potential energy savings in the indoor lighting plant, thanks to new technologies as LED lamps and Building Automation System. The case study, applied to a big shopping mall in the middle of Italy, shows great results, thanks to the high efficiency of LED technology, high number of operating hours and the implementation of a control system. An economic and environmental evaluation is reported.

Architectural engineeringEnvironmental evaluationEnvironmental EngineeringEmerging technologiesComputer science020209 energyEnergy Engineering and Power Technology02 engineering and technologyIndustrial and Manufacturing Engineeringlaw.inventionlaw0502 economics and business0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringBuilding automationSettore ING-IND/11 - Fisica Tecnica Ambientalebusiness.industryRenewable Energy Sustainability and the EnvironmentShopping mall05 social sciencesLEDEnergy SavingEnergy consumptionshopping centerLED lampindoor lighting plantHardware and Architecturebusiness050203 business & managementEfficient energy use
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An experimental study on relationship between LED lamp characteristics and non image-forming

2017

The general aim of the experimental study, presented in this paper, was that to investigate the relationship between the characteristics of five different types of LED (Light Emitting Diode) lamps, which are nowadays those allowing the highest energy consumption reduction, and the humans non image-forming (NIF) reactions.

EngineeringEnvironmental Engineering0211 other engineering and technologiesEnergy Engineering and Power Technology02 engineering and technologySettore ING-INF/01 - ElettronicaIndustrial and Manufacturing EngineeringLed lamplaw.inventionReduction (complexity)03 medical and health sciences0302 clinical medicinelawCircadian system021105 building & constructionElectrical and Electronic EngineeringLightingSettore ING-IND/11 - Fisica Tecnica Ambientalebusiness.industryElectrical engineeringEnergy consumptionSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaLED lampOptoelectronicsbusiness030217 neurology & neurosurgeryLighting colorLight-emitting diode2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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Multicolour LEDs in educational demonstrations of physics and optometry

2014

LED light sources are used to design experimental setup for university courses teaching human color vision. The setup allows to demonstrate various vision characteristics and to apply for student practical exercises to study eye spectral sensitivity in different spectral range using heterochromatic flicker photometry. Technique can be used in laboratory works for students to acquire knowledge in visual perception, basics of electronics and measuring, or it can be applied as fully computer control experiment. Besides studies of the eye spectral sensitivity students can practice in trichromatic color matching and other visual perception tasks

EngineeringVisual perceptionColor visionbusiness.industryFlickerComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONVisualizationlaw.inventionLED lampPhotometry (optics)Spectral sensitivitylawComputer visionArtificial intelligencebusinessLight-emitting diode12th Education and Training in Optics and Photonics Conference
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A device for multimodal imaging of skin

2013

A compact prototype device for diagnostic imaging of skin has been developed and tested. Polarized LED light at several spectral regions is used for illumination, and round skin spot of diameter 30mm is imaged by a CMOS sensor via crossoriented polarizing filter. Four consecutive imaging series are performed: (1) RGB image at white LED illumination for revealing subcutaneous structures; (2) four spectral images at narrowband LED illumination (450nm, 540nm, 660nm, 940nm) for mapping of the main skin chromophores; (3) video-imaging under green LED illumination for mapping of skin blood perfusion; (4) autofluorescence video-imaging under UV (365nm) LED irradiation for mapping of the skin fluor…

Multimodal imagingCMOS sensorMaterials sciencebusiness.industryPolarizing filterlaw.inventionLED lampAutofluorescenceNarrowbandOpticslawMedical imagingbusinessLight-emitting diodeSPIE Proceedings
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Tunable structured illumination system based on a Wollaston prism

2018

Experimental verification of a simple illumination system to generate a 1D structured pattern with tunable modulation frequency is shown based on a Wollaston prism illuminated by the diffracted field of an incoherent linear source.

PhysicsDiffractionbusiness.industryStructured illumination microscopyPhysics::OpticsWollaston prismStructured illuminationlaw.inventionLED lampOpticslawSpatial frequencybusinessFrequency modulationImaging and Applied Optics 2018 (3D, AO, AIO, COSI, DH, IS, LACSEA, LS&C, MATH, pcAOP)
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Technical‐economic evaluation of the effectiveness of measures applied to the artificial lighting system of a school

2021

Ensuring optimum interior lighting is a topic of great importance, as this influences not only the well-being of users but also the optimal performance of visual tasks. Lighting can be natural, but if not sufficient, it can be compensated with artificial lighting. This study highlights a methodology for designing a new lighting system that takes into account both technical and economic aspects. The method was applied to an existing school located in southern Italy, in which the electricity consumption is related to the current lighting system. The school is chosen as being representative of the construction type and layout of many local schools. In addition, the coexistence of several visua…

SchoolArchitectural engineeringTechnologyComputer scienceQH301-705.5020209 energyQC1-999LENI02 engineering and technology010501 environmental sciences01 natural sciencesDimmingIlluminancelaw.inventionlaw0202 electrical engineering electronic engineering information engineeringGeneral Materials ScienceDaylightBiology (General)InstrumentationQD1-999Lighting0105 earth and related environmental sciencesFluid Flow and Transfer ProcessesConsumption (economics)Artificial lightbusiness.industryProcess Chemistry and TechnologyTPhysicsLEDGeneral EngineeringEnergy consumptionEngineering (General). Civil engineering (General)ComfortComputer Science ApplicationsLED lampDynamic simulationEnergy consumptionChemistryEconomic evaluationDaylightElectricityTA1-2040businessDynamic simulation
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Study of Influence of the LED Technologies on Visual and Subjective/Individual Aspects

2018

The general aim of this paper is that to further deepen and elaborate the results obtained in a previous study of the authors, in which the relationship between the characteristics of five different types of LED lamps and the humans non-image-forming reactions were investigated, by conducting a more detailed statistical analysis and by highlighting the neurological aspects.

Settore ING-IND/11 - Fisica Tecnica Ambientalelightingbusiness.industryComputer science0211 other engineering and technologiesled lamp02 engineering and technologySettore ING-INF/01 - ElettronicaIndustrial engineeringVisualizationlaw.inventionSettore ING-IND/33 - Sistemi Elettrici Per L'EnergiaLED lamp03 medical and health sciencesMarket research0302 clinical medicinelaw021105 building & constructioncircadian systemlighting colorStatistical analysisStatistical dispersionbusiness030217 neurology & neurosurgery2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
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<title>Computerized device for critical flicker fusion frequency determination</title>

2003

The critical fusion flicker frequency of the human visual system is the threshold sensitivity for a sine wave-modulated patch of monochromatic flickering light measured as a function of its temporal frequency and average luminance level. The critical flicker fusion frequency changes in different ocular and non-ocular conditions, for example: high-myopia, AMR, glaucoma, schizophrenia, after alcohol intake, fatigue. A computerized test for critical flicker fusion frequency determination was developed. Visual stimuli are two monochromatic LED light sources that are connected to a microcircuit driven by a computer program. The control of the device is realized through the parallel port of the P…

Visual perceptiongenetic structuresComputer sciencebusiness.industryFlickerFlicker fusion thresholdLuminanceeye diseaseslaw.inventionLED lampOpticslawHuman visual system modelMonochromatic colorbusinessSensitivity (electronics)SPIE Proceedings
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Warm white LED light by frequency down-conversion of mixed yellow and red Lumogen®

2013

This work reports on the benefits and promising opportunities offered by white LED hybrid technology, based on a mixing perylene-based dyes in order to obtain a warm white light for frequency-down conversion. In a standard Ce:YAG-based white LED, the white light appears cold due to the weakness of red wavelength components in the emission spectrum. In order to obtain a warmer white, one possible solution is to add a red phosphor to the yellow one to move the chromatic coordinates properly, though the luminous efficiency drastically decreases due to the increased light absorption of the coating layer. It is generally believed that the low efficiency of warm white LEDs is the main issue today…

Warm white LEDs hybrid LEDs perylene-based dyes Lumogen® LED optical characterization dip coatingMaterials sciencebusiness.industryPhosphorColor temperatureSettore ING-INF/01 - Elettronicalaw.inventionLuminous fluxColor rendering indexLED lampchemistry.chemical_compoundchemistrylawOptoelectronicsbusinessLuminous efficacyPeryleneLight-emitting diode
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