Cheers LondonJ,
Thats exactly what I was after, while I had read the general information of the model, none of the books I have actually tell me what the reference for "short" and "long" is. Without knowing that the reference for this terminology is 1 micrometer, its impossible to answer the question from first principles.
As you say, if we are talking shorter or longer than 1 micrometer then there is no problem at all; as that would include all visible light and a small band of IR which would certainly be the majority of the emitted radiation from the sun.
All this being said I think the biggest absurdity ive seen yet are the variances in the units of measurements, especially in the conditions for VMC.
Imperial units of measurement for height, knots used for airspeed and meters used for horizontal distance. Really made me cringe.
Cheers
Miguel