Lehner Hiamp?

[Nick]

Hello guys, thinking of getting a Lehner 1940 or 1950 for my RC8 on 4-6s. Not sure which yet, leaning towards a 1950 for the 5mm shaft (although I noticed on their website they say for "LK" versions only, what does LK stand for?).

Just want to know what the Hi-Amp versions are and just the general difference between standard and Hi-Amp?

And also, what are Neu's like in comparison? Anyone who has experience with both would be appreciated (in a performance POV, price isn't a factor for me).