Join Date: May 2004
Location: SIN (LEJ once a year)
Programs: SQ, LH, BA, IHG Diamond AMB, HH Gold, SLH Indulged, Accor Gold, Hyatt Discoverist
Posts: 7,739
If OP is arriving in SQ Biz then LH Arrival Lounge access is not permitted. You need to be on LH, LX, OS J or I think UA possible as well or be SEN etc. You also need to enter Germany for that.
If onward LH flight is in Biz, LH Biz lounge would be accessible, if in Eco then not. If *G then SEN lounge.