Diagnostic applications do not require the same level of attention to aesthetics as front panel applications, since the LED is generally viewed by a technician, and not designed to enhance the appearance of the equipment. However, the devices must still deliver consistent brightness and be positioned to ensure that the proper indicator is read. A key design goal in diagnostic applications is achieving maximum component density, so 2-mm LEDs with an integral currentlimiting resistor are employed to conserve circuit board space, which also reduces parts count. The LED is not viewed in bright light, so there is no need for a high-intensity device.
Front panel applications require the same attention to component density, with increased emphasis on aesthetic appeal. The LEDs must not only provide the basic indication or illumination function, but also complement the appearance of the host equipment, since they are located on the front panel for all to see. In many cases, the appearance of the LEDs is actually a selling feature of the end product. Consequently, uniform color, alignment, and intensity are important considerations.
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