Datasheet
LUXEON LED Assembly and Handling Application Brief AB32 20121217 7
LED Outline and Backside Metallization
While the fiducial marks provide the most accurate technique to find the optical center of the silicone lens, one can also use the edges or the
backside metallization to locate the theoretical optical center of a LUXEON LED. Figure 2 and Figure 4 illustrate the position of the optical center
with respect to the edges of the ceramic substrate for the two different LUXEON LED configurations. In both configurations the optical center is
located 1.525mm from the top and side of the LUXEON LED edges.
The optical center can also be located using the edges of the thermal pad on the bottom of the ceramic substrate as shown in Figure 6. The actual
position of the center of the lens will be within a circle with a diameter of 0.350mm with respect to the theoretical optical center found using the
edges of the thermal pad as a reference.
Figure 6. The theoretical optical center may be located using the edges of the thermal pad on the bottom of a LUXEON LED.
The center of the silicone lens will be within a 0.35mm radius with respect to the theoretical optical center. All dimensions are in mm.