This is all I find on the forums on the details of the CLH…but any photos would be helpful.
According to the SFB Master Ship Time Line, the CLH was introduced in Y140, or in SFC terms, 2240.
From Module R2:
"Two old-stlye (Texas Class) light cruisers were converted for use as hospital ships (NCC 948 Refuge and NCC 949 Sanctuary). They were intended for peacetime use in fighting plagues and other natural disasters. Being built in warship hulls (albeit old ones), they could reach the scene of any outbreak within the fraction of the time needed by Auxiliary Hospital Ships."