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Once limited to simple status indicators, Light Emitting Diodes (LEDs) now play prominent roles in back lighting, panel indication, decorative illumination, emergency lighting, animated signage, etc.... The emergence of LEDs as a viable alternative to incandescent lighting can be attributed to new manufacturing technologies, packaging innovations and an increasing number of colors. These factors along with the growing awareness of the advantages of LEDs (e.g., a life span measured in years not hours, vivid sunlight-visible colors and low power requirements) have engineers, product designers, purchasing agents and component vendors viewing LEDs in a whole new light. For many applications LED lamps are superior to incandescent lighting. So why is it that in tens of millions of switches, indicators, control panels, signs, annunciators, displays, decor lights and dozens of other applications, design engineers still specify incandescent technology? It might be that they're just a few years behind what's really happening in LED illumination. Although advances made in LED technology in the past few years have dramatically broadened the applications for these rugged little light sources, it wasn't that long ago that red was the only "daylight-visible" colored LED. And that wasn't the only thing limiting their use! Unlike incandescent bulbs that give off the full spectrum of light in a spherical pattern, LEDs emit a focused beam of a single wavelength (color) in only one direction, in a variety of angles. For many applications, such as indicators or switch illuminators, this is not a problem, but it took the development of multi-chip arrays and high-flux LED chips to begin to achieve the effect of an incandescent filament. Major advancements in LED technology have taken place in recent years such as development of new "doping" technologies that increase LED light output by as much as 20 times over earlier generations, and allow the production of daylight-visible LEDs in virtually any color of the spectrum. In addition to red, yellow, and amber/orange, LEDs are now available in many colors from leaf green to ultra blue. Even white light, long thought be an impossibility, is now available in three different shades as a light-emitting diode. The efficiency of LEDs is most apparent in applications requiring color. Light from a typical incandescent bulb must be filtered so that only light from a particular part of the spectrum (e.g., red, amber or green, etc...) for example--is visible. While LEDs deliver 100 percent of their energy as colored light, incandescent bulbs waste 90 percent or more of their energy in light blocked by the colored lens or filter. Incandescent bulbs also waste 80 percent to 90 percent of their energy on heat generation to reach the temperature for which (Kelvin scale) they are designed. The point is that what was once a fairly marginal light source isn't marginal any more. In many applications, LEDs exceed the energy available from incandescent bulbs and offer significant additional benefits making LED clusters and lamps as friendly to the environment as they are to the operating budget.

Description Page Application Notes. 4 5 `uestionnaire. T1 (3mm) Sub-Midget Based LEDs. T1 (3mm) Sub-Midget Bi-Pin Based LEDs. T1-1/2 (4.5mm) Midget Wedge Based LEDs. T1-3/4 (5mm) Midget Wedge Based LEDs. T1-3/4 (5mm) Midget Flange Based LEDs. T1-3/4 (5mm) Midget Groove Based LEDs. T1-3/4 (5mm) Midget Screw Based LEDs. T1-3/4 (5mm) Midget Bi-Pin Based LEDs. T3-1/4 (9mm) Miniature Based LED Lamps. T3-1/4 (9mm) Miniature Wedge Based LEDs. T3-1/4 (9mm) Miniature Scew Based LEDs. 20 S6 Candelabra Screw Based LEDs. 21�22 T5.5K European Telephone Slide Based LEDs. 23 T6.8 European Telephone Slide Based LEDs. 24 T2 ANSI #5 Telephone Slide Based LEDs. 25 T2 ANSI & #3 Telephone Slide Based LEDs. T2 #1 Telephone Slide Based LEDs. 27 LED Color Chart. 28