1. Adato (2008) Adato Energia Oy. Energy use in households 2006. Helsinki. ISBN 978-952-9696-41-3. Reserach report. 49 p. In Finnish: Kotitalouksien sähkönkäyttö 2006. Available from http://www.motiva.fi/files/1353/Kotitalouksien_sahkonkaytto_2006_-raportti.pdf
2. Curtis, D. (2009) Predictions for the contribution of residential lighting to the carbon emissions of the UK to 2050. Environmental Change Institute, University of Oxford. Available from http://www.eci.ox.ac.uk/publications/downloads/curtis-EEDAL09.pdf
3. D5 (2007) National Building Code of Finland D5. Calculation of energy use and need of heating, guidelines 2007. Ministry of the Environment. In Finnish: Suomen rakentamismääräyskokoelma D5. Rakennuksen energiankulutuksen ja lämmitystehontarpeen laskenta, Ohjeet 2007. Available from http://www.finlex.fi/data/normit/29520-D5-190607-suomi.pdf
4. DECC (2010) UK Department of Energy and Climate Change. Valuation of Energy Use and Green House Gases (GHG) Emissions for Appraisal and Evaluation. Report. 25 p. Available from http://www.decc.gov.uk/assets/decc/statistics/analysis_group/1_20100125163218_e_@@_valuationenergyuseggemissionsbackground.pdf
5. DOE (2010) U.S. Department of Energy, Energy Efficiency and Renewable energy. Pontential of Solid State Lighting in General Illumination Applications 2010 to 2030. Prepared by Navigant Consulting, Inc. for U.S. Department of Energy, Building technologies program, Washington DC, February 2010. Report. 47 p. Available from http://apps1.eere.energy.gov/buildings/publications/pdfs/ssl/ssl_energy-savings-report_10-30.pdf