Solid state lighting using light transmissive solid in or forming optical integrating volume

A lighting apparatus comprising:

• one or more solid state light emitters, the one or more solid state light emitters producing light intensity sufficient for a general lighting application in a region or area intended to be occupied by a person;
• an optical integrating volume, outside an enclosure of the one or more solid state light emitters, for receiving and optically integrating light from the one or more solid state light emitters and for emission of integrated light in a direction to facilitate said general lighting application;
• and
• a light transmissive solid, having:
• a) a light emitter interface region for each solid state light emitter closely conforming to the light emitting region of each solid state light emitter,
• b) a surface conforming closely to and in proximity with a diffusely reflective interior surface of the optical integrating volume, and
• c) a light emission surface at least a portion of which forms a transmissive optical passage for emission of integrated light from the optical integrating volume in a direction to facilitate said general lighting application in the region or area.