A build-out-of-the-box approach to turn, tail, and stop lighting applications on vehicles significantly reduces engineering and development costs. With recent improvements to Snap LED, an automotive LED assembly, the need for retesting and screening is removed, which can save users on operational costs, reduce equipment and manpower needs, speed production, and improve finished goods yields. The LED assemblies can be shaped to any contour, allowing users to create more innovative and streamlined designs. SnapLED's solder-less clinch fastening technology is a formable metal substrate designed for ease of design and installation.

SnapLED array for a rear combination lamp.
The maximum junction temperature has been increased to 135°C, which gives engineers more flexibility in their design efforts as they create new lighting solutions. Flux bin sizes, which were already small, have been reduced by as much as 67% so that flux variations within a bin are imperceptible to the human eye. The forward voltage bin widths have been reduced by as much as 50%, making the use of low-cost, resistor-based driver circuits easier to implement. SnapLED is designed to operate over a dynamic current range of 30:1, allowing for simplified and reliable designs for both stop- and tail-mode operation.

LEDs in stop-tail signaling lamps tend to operate at the extremes of current limits, and can have difficulty meeting the performance and uniformity requirements without expensive electrical designs. With SnapLED’s dual binning, flux ratios between different current levels and uniformity across the entire dynamic range are highly controlled. This precision makes it easier to implement a solution without the need of retesting LEDs prior to assembly, as the uniformity and flux performance are already narrowly defined.

A new testing regime, Multi Environment Over stress Testing (MEOST), exceeds the testing required by today’s standards for automotive signaling LED sources and has been implemented for SnapLED. MEOST also exceeds AECQ101, including simulations for extreme operational conditions.


Lighting Technology Magazine

This article first appeared in the November, 2011 issue of Lighting Technology Magazine.

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