Just came across the attached article which presents results from a survey in the city of Dehradun (India). 

Some interesting highlights: 

  • Vendors need light 2.5 hours per day in summer and 3.45 hours per day in winter.
  • Of the current vendors, 59% use pressurized kerosene lanterns, and 21% rely on streetlighting. 
  • Daily expenditure for kerosene is 13.4 Rs (or about $0.21). 
  • There was high preference for a solar lantern rental option (over direct purchase).

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