Results 1 to 10 of about 6,294 (295)

Using identification method to modelling short term luminous flux depreciation of LED luminaire to reducing electricity consumption [PDF]

Scientific Reports, 2023
Reducing electricity consumption is currently one of the most significant global issues. Luminaires and light sources are characterised by relatively low rated power values.
Roman Sikora, Przemysław Markiewicz, Ewa Korzeniewska   +2 more
doaj   +3 more sources

Luminous Flux in Ex-Vivo Porcine Eyes during Endoillumination and during Transscleral Illumination Depending on the Transmission Properties of the Eyewall

Photonics, 2023
(1) Background: During eye surgery, it is important that sufficient light enlightens the inside of the eye for small structures to become visible. The intraocular brightness is influenced by the luminous flux of the illumination system.
Nicole Fehler, Martin Heßling
doaj   +5 more sources

Reliability Assessment of Light-Emitting Diode Packages With Both Luminous Flux Response Surface Model and Spectral Power Distribution Method

IEEE Access, 2019
The inherent luminous characteristics and stability of LED packages during the operation period are highly dependent on their junction temperatures and driving currents.
Wei Chen, Jiajie Fan, Cheng Qian, Bin Pu, Xuejun Fan, Guoqi Zhang   +5 more
doaj   +4 more sources

Junction temperature and luminous flux prediction for white LED array based on electrical-photo-thermal modeling

Case Studies in Thermal Engineering
During the operation of an LED array, its thermal and optical performances are always not equal to the superposition of the individual LED's characteristics because of a significant thermal coupling effect between the arrays.
Minne Liu, Wenyu Li, Wei Chen, Mesfin S. Ibrahim, Jingkang Xiong, Guoqi Zhang, Jiajie Fan   +6 more
doaj   +5 more sources

Analysis of a Fiber-Coupled RGB Color Sensor for Luminous Flux Measurement of LEDs [PDF]

Sensors
Accurate measurement of luminous flux from solid-state light sources typically requires spectroradiometric equipment or integrating spheres. This work investigates a compact alternative based on a fiber-coupled RGB photodiode system and develops the ...
László-Zsolt Turos, Géza Csernáth
doaj   +2 more sources

Time-Dependent Optothermal Performance Analysis of a Flexible RGB-W LED Light Engine [PDF]

Micromachines
The wide application of light emitting diodes (LEDs) in lighting systems has necessitated the inclusion of spectral tunability by using multi-color LED chips.
Md Shafiqul Islam, Mehmet Arik
doaj   +2 more sources

A Novel Localization Technique Using Luminous Flux [PDF]

Applied Sciences, 2019
As global navigation satellite system (GNNS) signals are unable to enter indoor spaces, substitute methods such as indoor localization-based visible light communication (VLC) are gaining the attention of researchers.
Muhammad Irshad, Wenyuan Liu, Jehangir Arshad, M. Noman Sohail, Aparna Murthy, Maryam Khokhar, M Musa Uba   +6 more
doaj   +2 more sources

A Luminous Efficiency-Enhanced Laser Lighting Device with a Micro-Angle Tunable Filter to Recycle Unconverted Blue Laser Rays

Micromachines, 2021
In this work, a phosphor converter with small thickness and low concentration, based on a micro-angle tunable tilted filter (ATFPC), was proposed for hybrid-type laser lighting devices to solve the problem of silicone phosphor converters’ carbonizing ...
Xinrui Ding, Ruixiang Qian, Liang Xu, Zongtao Li, Jiasheng Li, Caiman Yan, Binhai Yu   +6 more
doaj   +1 more source

Research Control Devices for LED Light Sources under Their Operating Conditions at Elevated Temperatures

Applied Sciences, 2023
The electrical and light characteristics of light-emitting diodes (LEDs), upon which modern lighting devices are constructed, are significantly influenced by ambient temperature.
Iryna Beliakova, Vadim Piscio, Pavlo Maruschak, Oleksandr Shovkun, Volodymyr Medvid, Roman Mykhailyshyn   +5 more
doaj   +1 more source

Measuring System for Determining the Quality of LED Light Sources and an Overview of LED Light Bulbs for Household Use

Sensors, 2022
Modern LED light sources have many advantages, as well as some disadvantages. One of the disadvantages is the pulsating luminous flux, which, in some cases, affects people’s health and well-being negatively.
Matic Markovič, Andrej Orgulan, Primož Sukič   +2 more
doaj   +1 more source