Yes - I feel that will be a perennial...
I'm not surprised by the result for the Smart. It's a damn bright light for the unit. Top marks for that, but the suddenness of the edge means that you will miss peripheral stuff because of the contrast. So the value of the bright centre circle is compromised.
I used to have one of those. Very nice light indeed. The centre spot is very bright, but there is some fairly even spill off from the sides (as seen). What you end up with is a light where stuff 20m away is visible, then at 10m the pothole disappears, then reappears at 2m. Perfectly usable and probably my favourite light set as I much prefer the colour of halogens.
As has been said, setting th ecamera on RAW should allow direct comparison of the colours. The colour temperature will be an arbitrary approximation as they are not complete spectrums. Processing in PS with a fixed colour temp will allow them to be compared directly.
For ease of comparison, is there a standard reference lamp or do I have to find the identical lens and target material (I think I have the same camera body - D80?)
Which light meter did you use? I have an old weston Mk III kicking about so could measure EV for the AyUps pretty easily (as my Seecrit Bunker is longer than Charlottes - oo aah missus).