Where is the LED located within a lamp package?
Typically, a customer who is asking for this information is designing a secondary lens. Unfortunately, the die location is not precise enough to design a good imaging optics secondary lens. There are several reasons why this occurs. 1. To design a lens the designer needs to know the near field radiation pattern. This pattern is different from the radiation pattern shown in data sheets. Also, we have never characterized the near field radiation pattern of our lamps. 2. The customer is assuming the LED is a point source. This holds when viewed from a distance. In the near field the LED is a three dimensional light source. Light can be emitted from the top and sides of the die. Table 1.
Related Questions
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