Determination of the Effective Projected Luminous Lens Area (EPLLA) by Design Analysis
This SAE Standard provides a method for determining the Effective Projected Luminous Lens Area (EPLLA) of a lamp function using design analysis. This standard was created to clarify and address how to determine EPLLA with traditional and new technologies. Lamps can be evaluated using the method described in SAE J3333; however, no lamp is subjected to both methods.
Rationale: SAE standards and FMVSS 108 requires a minimum effective projected luminous lens area (EPLLA) for many signal lighting functions. In the past, the determination of the EPLLA was straightforward since most lamps utilized a reflector, a bulb, and a colored cover lens with optics. Newer lighting technologies such as LEDs, reflector type optics with no optics in the cover lens, light pipes, multicolor LEDs, etc. have complicated the determination of EP LLA. This standard was created to clarify the criteria for determining EPLLA through Design Analysis using newer technologies as well as traditional technologies. During the development of this standard, many current and future lamp designs and technologies were considered to ensure that the standard adequately addressed how EPLLA should be determined. This standard contains the industry consensus for these criteria.
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