The Analysis of The Visibility with Clear Outer-Lens LED Stop Lamp

There is some concern that the lamps with clear outer-lenses, make it difficult in bright or sunny conditions to decide whether the stop lamp is on or not.

In order to prevent the conspicuity problem for new product, simulation technology and a design guide for stop lamp with clear outer-lens is required.

This report develops the relationship between conspicuity and luminance contrast by conducting the conspicuity experiment in both lit and unlit condition with the sample of LED light source and clear outer-lens. The precision of the optical simulation is also verified by comparing the experiment measurement and simulation result. This report demonstrates the new evaluation method from the result of experimental study and simulation analysis, as well as verifies its adequacy.