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A wavelengh quiz!!

aryntha

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"Mechtric" - Mechtric - Major supplier for traffic lights in Australia.

KCC Traffic Control Signals:
http://www.mechtric.com.au/ProductImage/Page_78.pdf

Seeing as LEDs do not operate over a single wavelength, and generally vary (easily) between +/- 5-10nm (+/- 5nm of the aforementioned spec), they in fact appear to be virtually the same as the US:

Red: 630nm (Within the '+/- 5nm' of 625nm)
Amber: 594nm (Within the '+/- 5nm' of 590nm)
Green: 505nm (Same.)

532nm InGaN LEDs are very, very expensive in quantity compared to 505nm. They are also not available in nearly the same lumen efficiency as 505nm (meaning, more current draw for poorer brightness.)

These "True Green" InGaN LEDs are relatively new to the market, (and certainly would not have been available in such volume on an LED traffic light installed, say, 5-7 years ago) and are still rather low yield compared to their 505nm counterparts.

It'd simply make little sense to use them - especially in a 'high failure' and 'high volume low cost' environment such as traffic lights -- and from what it seems, Australia, indeed, does not.
 
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