Dunno - but I wish to hell they'd ditch blue taxiway sideline lights in favour of green centreline. At a strange airport, a carpet of 'blue pinprick...black area....blue pinprick....black area....blue pinprick....etc' (which black area is the one I'm supposed to taxi into?) is not as clear as 'follow the (green) breadcrumbs'. Fair enough blue boundary lights ie anywhere within the large area surrounded by blue is safe movement area, but that's not the same as a bunch of taxiways