Well, I always thought that flaring at the correct height came from looking a long way down the runway, not from using peripheral vision or actually turning to the side to judge height. Looking straight ahead a long way down provides good lateral guidance as well - one simply can't judge height quickly/accurately enough "close in". On the Lockheed, we closed the thrust levers at 30', checked back a degree or two and waited and never, ever, pushed forward to roll it on...!).
In a word PTH, I don't think the height of the runway lights affects much in terms of judging flare height.