(09 Jul 2014, 9:15 pm)Dan wrote Sorry if I've misinterpreted the quote you gave, but if red light is the only permitted form of light, how are 'normal' coloured LEDs acceptable?
Again, not sure. I suspect it is all open to interpretation.
I think the issue of White light LED on the rear is more prominent, as compared to Orange LED, you only expect to find White light at the front of a vehicle (unless of course it is reversing).
But, it may well be that under that quote, any form of LED is acceptable nowadays as 'illuminating a route indicator'.
I fully agree that no company will be using White rear LED sets with knowledge that they may be illegal. I suspect all that are fitted, are done with good intention and where they are not, either a mix of cost appreciation (Orange LED sets are cheaper!) or a particularly over cautious operator!