Clark, William F.2014-10-152014-10-1519541954b14678822https://hdl.handle.net/2144/9248Thesis (Ed.M.)--Boston Universityen-USBased on investigation of the BU Libraries' staff, this work is free of known copyright restrictions.A critical evaluation of the relative visual effiency, the relative costs of installation, and the relative costs of operation of classroom artificial lighting systems in selected elementary school buildings in MassachusettsThesis/Dissertation