I dont see orange lights shown in the photos here. All I see is the standard units which appear to have less of the normal red dye in them than average. Genuine orange lights would have been made with the amber dye that Lesney used for glazing & lights on other models
I agree with Micks conclusions, but i still think that the unusual colour of the lights makes this model very interesting. I would be happy with it in my collection. Nice one Mathias.