There is no amber coating on the LEDS.
Amber is created via the LED phosphor.
LW Amber is a true phosphor within the LED, “Turtle Friendly” (single-wavelength, much easier to filter out for observatories, etc). Much friendlier to wildlife, migratory animals, etc. Florida and other locations require true-amber for wildlife-friendly applications (see the 3100C_WL.pdf, only Hydrel true-Amber fixture. It's a bollard).
PC Amber is a combination of blue and yellow phosphors that combine to create an Amber color LED. Much higher lumen output than pure amber. The phosphor is scattered wavelengths that is harder to filter.
NOT generally considered “Turtle Friendly” because of traces of light outside of specified wavelengths
In order to provide life expectancy of the LEDs, we would need to know the exact fixture configuration and whether LW Amber or PC amber was utilized.
The fixture info should list this.
Per Yaser Abdelsamed:
“The Lithonia DSX2 (AMBPC option) uses a phosphor-converted amber LED. This LED is made with a formulation of phosphors that essentially eliminates shorter wavelengths (sub 500nm). This phosphor is captured under a silicone dome that is applied to the LED at the point of manufacturing by our LED supplier. And once the LED is assembled into our DSX2 luminaire, there is absolutely no opportunity for the Silicone dome or phosphor to be mechanically knocked off. This mechanical knock-off would peel the phosphor away from the die and is the only way that the underlying LED could emit blue light in any meaningful quantities. Since all of this is mechanically protected by our luminaire module lens assembly, there is no opportunity for this to occur in the field, eliminating the possibility of undesirable short wavelength light. And in terms of long-term degradation, this LED formulation was developed for us by the world’s #1 LED and Phosphor supplier (Nichia), ensuring the best possible combination of lumens and phosphor durability properties. In short, we have the highest confidence in the LED (die & phosphor) and luminaire design.”
See image of LED attached. The morphed yellow “square” is the LED die covered in phosphor (yellow due to blend of specific phosphors used for LED’s) . The square is deformed looking due to the “lens effect” of the transparent silicone dome… ever see those silly “coke-bottle” glasses and how they make someone’s eyes appear? The half sphere is the silicone dome.