Flux lighting

You read about illuminance on the one hand and about luminance on the other hand? And now you ask yourself: Is it the same? Or is there a difference between both terms? There are many terms used in the lighting world and often people use them interchangeably even if they have total different meanings. To stop your confusion we will tell you the exact meaning of luminance and illuminance in this article. ContentsIlluminance vs LuminanceWhat is luminous flux?What is illuminance?What is luminance?Shop Related ProductsHow do we measure illuminance and luminance?What are the differences between illuminance and luminance?ConclusionShop Related ProductsThese two terms seem to be similar at a first glance. This is why people use them interchangeably, yet the truth is that they have different meanings. This can be a cause for confusion and misunderstandings.We will distinguish between illuminance and luminance in the following paragraphs. But first, we need to take a look at another important term, the luminous flux.What is luminous flux?When buying a light bulb, you are usually concerned only about the amount of light emitted by the bulb. This amount of light is called the luminous flux or luminous power. It measures the visible light that comes from the source. The measurement used for luminous flux is the lumen.The number of lumens produced by a lighting fixture determines its brightness. But when choosing a lighting fixture, you should not base it on its lumen output alone. The reason for this is that lumens only measure the light being emitted by the light source. It does not measure the amount of light perceived by the human eye in a given application. It can result in an inaccurate image of the performance of the fixture.In other words, the lumen output should not be the determining factor for the suitability of a lighting fixture. In order to evaluate the lighting fixture, you should measure the illuminance and the luminance.What is illuminance?Illuminance is the intensity of light falling on a surface area, such as a wall or a desk. It is not the same as the amount of light produced by a light source. The illuminance is also called incident light. This incident is the beam of light actually landing on the surface.The illuminance will be of high value if the area illuminated is close to the light source. If the light lands on a horizontal surface, such as a desk, it

Glass. Table 1. Light properties of PiS WLED doped with 8.5 and 9 wt.% YAG phosphors and PiG WLED covered with phosphor glass. SampleCCT (K)CCT Difference Range (K)CIE 1931 x,yPiG5564−44–+21(0.3306, 0.3750)PiS 8.5 wt.% 5469−69–+113(0.3278, 0.3746)PiS 9.0 wt.% 5311−39–+61(0.3382, 0.3937) Table 2. Light output flux of PiS WLED and PiG WLED. Table 2. Light output flux of PiS WLED and PiG WLED. SampleLight Output Flux (lm) Light Output Flux Efficiency (lm/W)PiS142.4 lm118 lm/WPiG133.2 lm110 lm/W Table 3. Normalized light output flux, CCT, and CRI of PiS WLED and PiG WLED, and measured data before and after 350 mA lighting for 1008 h. Table 3. Normalized light output flux, CCT, and CRI of PiS WLED and PiG WLED, and measured data before and after 350 mA lighting for 1008 h. SampleNormalizedLight Output Flux (%)CCT (K)CRI (Ra)0 h1008 hΔAverage (%)0 h1008 hΔAverage (%)PiS111%56525664+0.267.968.4+0.7PiG110%57385771+0.571.872.4+0.8 Table 4. Thermal properties of PiS WLED and PiG WLED. Table 4. Thermal properties of PiS WLED and PiG WLED. SampleTj (°C)Tc (°C)Tj − Tc (°C)Rth (°C/W) ΔRth (%)PiS88.456.831.637.4NAPiG81.351.030.335.6−4.0 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( Share and Cite MDPI and ACS Style Huang, C.-C.; Weng, T.-H.; Lin, C.-L.; Su, Y.-K. Light Output, Thermal Properties, and Reliability of Using Glass Phosphors in WLED Packages. Coatings 2021, 11, 239. AMA Style Huang C-C, Weng T-H, Lin C-L, Su Y-K. Light Output, Thermal Properties, and Reliability of Using Glass Phosphors in WLED Packages. Coatings. 2021; 11(2):239. Chicago/Turabian Style Huang, Chin-Chuan, Tsung-Han Weng, Chun-Liang Lin, and Yan-Kuin Su. 2021. "Light Output, Thermal Properties, and Reliability of Using Glass Phosphors in WLED Packages" Coatings

Platinum crucibles are loaded with a few grams of powdered sample, an appropriate flux and often other agents. The crucibles are inserted into the crucible holder.Platinum molds are then installed onto the mold holder, and the safety shield can be closed. Since the platinumware holders are made of ceramics, there is no risk of contamination during the fusion.When the user instructs the X-300 to launch the actual fusion, the safety shield locks, and then the oven door automatically opens, the platinumware holders enter the oven, the door closes andall heating steps are automatically started in sequence. Temperature is constantly monitored and displayed. An ambient LED lighting system switches to the color red.The side-to-side rocking of the crucible holder continuously mixes the flux with the sample.When the flux melts, it starts dissolving the sample. When all sample is dissolved, the oven door opens, the platinumware holders move forward and, during the time the door closes, the crucibles are tilted to the rightto empty their contents into the molds.Blowers located underneath cool the molds, while the oven remains powered, to gain time in the next cycle. When the molds are completely cooled, the ambient LED lighting system changes from red to blue, andthe user is informed that he or she can now pick up perfectly homogenous glass beads, ready for analysis by XRF.For solution preparation, the hot melt is poured into unbreakable beakers (instead of molds), which contains an acid stirred by an optional magnetic system.> -->