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When instantaneous power failure or a current surge by lightning stops the controller at abnormal conditions, the abnormally high electric current may continue running through the LEDs for an extended period of time. This can damage the LEDs in the system. Circuit protection against abnormally high current must be built into the system to protect against this.
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Non-Phosphor White LEDs at a Viewing Angle of 30
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A non-phosphor white LED is shown in Fig. 1.14.
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FIGURE 1.14
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A non-phosphor white LED at 19.28 mA.
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Features:
Emitted color: white High luminous intensity Technology: InGaN/Sapphire
Non-Phosphor White LEDs
A non-phosphor white LED is a 5-mm round LED made of a clear epoxy case. This type is unlike most other white LEDs because it does not use a phosphor but emits white light directly. The operating chemistry is like ZnSe (zinc selenide) there is one peak at ~460 nm and another stronger peak at ~560 nm. This is a normal trend for a non-phosphor white LED. The beam consists of a small hotspot surrounded by a larger, mainly circular corona (Fig. 1.14). Unlike the other ZnSe, a white LED does not have a yellow color dark amber to orange or a brown perimeter in its beam. The beam of this LED mostly lacks that particular feature. It provides only a very narrow ring at the perimeter that may have a yellow tint but that is rather faint. Two peaks are spaced relatively close to one another, Fig. 1.15. These LED emissions have no phosphor, Figs. 1.16 to 1.19.
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FIGURE 1.15 Spectrographic analysis of a non-phosphor white LED at 19.28 mA.
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FIGURE 1.16
Spectrographic analysis of a non-phosphor white LED at ~1.8 mA.
Luminous Intensity (Candlepower)
The luminous intensity, or candlepower, is the light density within a very small solid angle, in a specified direction. In other words, this is the total number of lumens from a surface emitted in a given direction. The unit of measure is candela. In modern standards, the candela is the basic of all measurements of light, and all other units are derived from it. Candlepower measurements are often taken at various angles around the source, and the results are then plotted to give a candlepower distribution curve. Such a curve shows luminous intensity (how bright the source seems) in any direction.
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3000 Intensity (counts)
600 Wavelength (nm)
FIGURE 1.17 Spectrographic analysis of a 5-mm non-phosphor white LED. (See also color insert.)
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500 600 Wavelength (nm)
FIGURE 1.18 Spectrographic analysis of a 10-mm non-phosphor warm white LED. (See also color insert.)
Luminous Flux
The luminous flux is the time rate of the flow of light. The unit of measure is the lumen. One lumen may be defined as the light flux emitted in a one-unit solid angle by a one-candela uniform-point source. The lumen differs from the candela in that it is a measure of light flux irrespective of direction. The lumen is used to express a quantity of light flux: total output of a source; output within a specific
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FIGURE 1.19 Spectrographic analysis of a 10-mm non-phosphor LED, when driven at 350.7 mA. (See also color insert.)
angular zone; amount of absorbed light, etc. However, if you need to calculate a characteristic that is not related to the human eye for example, the temperature increase due to absorbed light, you cannot use luminous flux. Instead, you must use the correct unit of power the watt.
Illumination
Illumination is the density of luminous flux on a surface This parameter shows how bright the surface point appears to the human eye. The appropriate units of measure are foot-candle and lux. One foot-candle is the illumination produced by one lumen uniformly distributed over one square foot of a surface, or conversely this is the illumination at the point of a surface which is one foot from, and perpendicular to, a uniform point source of one candela. So, foot-candles incident on a surface = lumens/area (sq. feet). Lux is used in the International System. Both have a similar objective, but meters are used for lux and feet are used for candelas. Therefore, one lux = 0.0929 foot-candles. Or, 1 fc = 10 lux
Luminance (Brightness)
Luminance (or brightness) is the luminous intensity of a surface in a given direction per unit of projected area of the surface. It can be expressed in two ways: in candelas per unit area, or in lumens per
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