R.Rat: Pilot assessment requires counting the lights to gauge distance. The question is how do you know the lights before the threshold are different to after? In 125ish RVR it will be difficult to estimate if there is a difference. While you say the light before the threshold are technically approach lights, they are also takeoff lights if full length is approved. In that case why would they not be the same as the rest of the rwy? You'll guess I do not know the answer 100%.