You may be interested in these reports from Spain. Thanks to Jaime Zamorano for these:
Zamorano, Jaime y Muñoz Marín, Víctor Manuel (2010)
Calibration of SQM-L photometers for the NixNox project. [ LICA report; nº #01]
http://eprints.ucm.es/12262/Zamorano, Jaime & Ruiz Carmona, Roque (2013)
Sky Quality Meter cross-calibration for the NixNox project. [ LICA report; nº #03]
http://eprints.ucm.es/18015/Nievas Rosillo, Miguel & Zamorano, Jaime (2014)
*PySQM the UCM open source software to read, plot and store data from SQM photometers*
http://eprints.ucm.es/25900/Zamorano, Jaime, Sánchez de Miguel, Alejandro, Martínez Delgado, David & Alfaro Navarro, Emilio (2011) Proyecto NixNox disfrutando de los cielos estrellados de España. Astronomía (142). pp. 36-42. ISSN 1699-7751
http://eprints.ucm.es/24185/Zamorano, Jaime, Sánchez de Miguel, Alejandro, Nievas Rosillo, Miguel & Tapia Ayuga, Carlos (2014) NixNox procedure to build Night Sky Brightness maps from SQM photometers observations.
http://eprints.ucm.es/26982/A night sky brightness network with data obtained with fixed SQM photometers of the Spanish Light Pollution Research Network.
http://guaix.fis.ucm.es/splpr/SQM-REECL
