LH = mydlink cameras that support cloud recording (ie DCS-8xxxLH except the 8200LH which is a Home Connect product) which are mydlink app-only. No GUI. No website support (yet).
L was used as the mydlink indicator (I have no idea why L was the letter and not M) so routers, NAS, and cameras with the L support the mydlink system (mydlink.com and the mydlink apps).
H = Home which was the original ending for D-Link Home products but it evolved to mydlink home.