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      11-08-2016, 11:38 PM   #16
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Drives: M340
Join Date: Aug 2006
Location: Seattle, WA

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Originally Posted by lemetier View Post
NHTSA's logic until recently with FMVSS standards had been the size of the indicator surface area rather than just lumens or color.

As LED's have become more common, the luminous output has increased while the diodes themselves have shrunk. Under UN Regulations (what most know as ECE) it's color and intensity so fewer and brighter diodes meet the regulations. This allows more design flexibility, enhanced functions such as dynamic (wiping/sequential) indicators with less expense (Automotive Amber Spectrum LED's are fairly expensive in comparison to Red and other colors that can use a red lens). The F10 uses 14 OSRAM Golden Dragon arrays for the rear signals for example, and it's 2x's the cost for red vs amber. Since there is no regulatory demand or incentive to justify the cost of Amber, red is used instead.

One drawback is a number of US market Vehicles have absurdly bright LED Brake Lights and or Turn Signals since only a minimum luminous output is calculated based on surface area.

Beginning next year, FMVSS NCAP Safety Ratings begin to change and Amber Turn Signals based on luminous output and dynamic functions earn credit towards the Star Ratings. In 2018, these become mandatory for MY2019 Vehicles.
Great info Sir! Thank You.
2020 G20 M340 xDrive - Portimao Blue - ZDA|ZPP|ZPX|1CR|1PE|6NW|6WD
2016 F10 535i xDrive - AW - Retired
2011 E92 M3 - AW……………....ED April 29th, 2010 - Retired
2007 E92 335i -Space Gray.....ED Oct 19th, 2006 - Retired
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