The article offers brief information on various resources that help consumers evaluate the effectiveness of LED (light-emitting-diode) lighting including the voluntary Lighting Facts Label, the Energy Star Label from the U.S. Department of Energy (DOE) and the Design-Lights Consortium's Qualified ...
The goniophotometer thus allows us to measure the light output of an LED along a circumferential area on two transverse planes. A process of interpolation and integration based on our measurements is calculated, from which the total light output over a spherical surface area, independent of ...
The Consumer Price Index (CPI) measures the change in average consumer goods prices over time. The Producer Price Index (PPI) measures prices at the wholesale level. The Federal Reserve prefers an alternate measure of consumer inflation: the Personal Con
Not a measure of brightness; instead, it’s a measure of how much electricity (or energy) a bulb consumes to reach its claimed brightness. Each type of light source, LED, Fluorescent, Halogen, or Incandescent has a different lumen-per-watt ratio. Below we’re going to use lum...
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Testing printed circuit board assemblies embedded with LEDs during the in-circuit test stage requires integrating an LED analyzer into the tester. Learn how to perform LED testing on an in-circuit tester using an automated system and analysis.
To find a monitor’s pixel density: Measure the screen’s diagonal size in inches Note the resolution (width × height in pixels) Use the formula: √(width² + height²) ÷ diagonal size For example, a 27-inch 1920 x 1080 monitor has a pixel density of about 82 PPI, while a 27...
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A scrupulous measure Scruple A scruple is a small amount of something, and is used in the system of apothecaries’ weight used by pharmacists. In this system, the smallest unit is the grain, and a scruple is equivalent to 20 grains. As weights increase, a dram is 3 scruples, an ounc...
One last test - which is always good to run - it is a “destructive test” on few LED boards to measure the hot plug current. This test consists of switching on the power supply (without connecting any LEDs) and then hot plug to the LED board. By doing this, the h...