Project Everest

Metric Measurement Experiment

[Impact Assessment - Solar Metrics] Solar, Malawi July 2019


 Hours of quality light provided

Quality light refers to the light provided by the GD-Lite compared to the light emitted by a single candle. A candle produces 12.5 Lumens of light whereas a single GD-Lite bulb produces 120 Lumens.


 Weekly financial savings

Weekly financial savings is deduced from the average amount spent on candes each week from Nanchli survey results and includes the cost of the GD-Lite.  


 Kilograms of CO2 saved

CO2 saved is derived from the amount of carbon that would have been released by each candle used. This is totalled up for average weekly candle usage across 18 months



Experiment build:

  1. Use the results of a survey in June 2018 to find data on the amount of money spent each week on candles.

  2. Average out this cost across the number of respondents.

  3. Extrapolate this data to go across 18 months as this is the most likely lifespan of the GD-Lite. 

  4. Locate data on how much CO2 is released by a candle per hour and the burning time of candles available in Malawi.

  5. Use the data on weekly expenditure on candles and how much candles cost on average to calculate how many candles are bought each week and how much CO2 is released per household/business.

  6. Using the specifications of the GD-Lite calculate how many hours of quality light is produced in each home/business.


Experiment Results:

Results of this experiment can be found here. In this link sheet 1 contains the mathematical calculations and sheet 2 discusses the method that was used to achieve this result. 


Our key findings after selling 240 units at an average life span of 18 months were:

  • 12,312,000 MWK saved
  • 255.528 Kg of CO2 not emitted
  • 524,160 hours of quality light provided
Tagged users
edited on 25th July 2019, 13:07 by Cameron Fields

Grace Blackford 5 months ago

Status label added: Metric Measurement Experiment

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