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Furthermore, achieving efficient and uninterrupted light transmittance from lightsource to exit point is the primary goal of successful lightpipe design. An ideal lightpipe/lightsource setup would provide 100% light transmittance out of the exit focal point. When this is not the case, the design is said to be experiencing a degree of “light loss”. In order to address this common condition, engineers need to ensure that the correct distance between the lightsource and the lightpipe is specified. As previously discussed, the larger the distance between both elements, the lower the amount of light that is readily available at the exit point. Conversely, too close of a gap runs the risk of creating mechanical interference or creating permanent damage to the electronic assembly. In order to mitigate these risks, design engineers need to run proper dimensioning and tolerance stack-up mechanical analysis to ensure pcb positioning, assembled lightpipe length, lightpipe material light refraction index, light source height, brightness, and power, and in the case board mount lightpipes, mounting spacer height, are clearly and properly defined to ensure optimum and reliable operation conditions.
