Depending on the type and quality of the product, solar lanterns can last up to several hours. GTZ released a report Solar Lanterns Test: Shades of Light on behalf of the Federal Ministry for Economic Cooperation and Development in March 2009, where they tested the top solar lanterns on the market. Some of the best lanterns had burn times up to 6 or 7 hours. The full report can be read at: http://www.lightingafrica.org/files/1938-09_GTZ_Solarleuchten_engl02.pdf
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