Senegal Solar Lights Quality Assurance and Guarantee Impact Evaluation
Last registered on December 19, 2019


Trial Information
General Information
Senegal Solar Lights Quality Assurance and Guarantee Impact Evaluation
Initial registration date
December 11, 2017
Last updated
December 19, 2019 1:20 PM EST

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Primary Investigator
The World Bank
Other Primary Investigator(s)
PI Affiliation
The World Bank
Additional Trial Information
On going
Start date
End date
Secondary IDs
In many sub-Saharan African economies, solar lighting product regulation is weak, with low-quality products being able to enter the market and mimic higher-quality products, resulting in distorted quality signals for buyers. Our baseline data show that consumers have difficulties in differentiating between good quality and bad quality technologies. The consequence is an inflated demand for the latter (i.e., there exists market spoilage) and potential welfare loss (Schmalensee, 1982; Wilde, 1981).
The proposed study has two objectives. First, it aims to examine pilot interventions aimed to overcome the problem of imperfect information faced by Senegalese consumers when choosing among different lighting products. We test whether pilot interventions can close the consumer’s information gaps and therefore counter market spoilage, i.e., increase demand for Lighting Global certified products relative to inferior products. Our results are of direct relevance for Lighting Africa (LA) whose primary goal is to expand access to better lighting for low-income households by developing third-party quality assessments of various lighting products aimed at accelerating market growth of quality solar products and countering market spoilage by inferior products.
The second objective of the proposed study is to examine the development impacts of the provision of high quality solar lanterns to provide evidence for the alignment between LA’s activities and the World Bank’s goal of reducing extreme poverty.
External Link(s)
Registration Citation
Coville, Aidan and Arndt Reichert. 2019. "Senegal Solar Lights Quality Assurance and Guarantee Impact Evaluation." AEA RCT Registry. December 19.
Former Citation
Coville, Aidan, Arndt Reichert and Arndt Reichert. 2019. "Senegal Solar Lights Quality Assurance and Guarantee Impact Evaluation." AEA RCT Registry. December 19.
Experimental Details
- Provision of information about quality of solar lighting products and guarantee schemes
Intervention Start Date
Intervention End Date
Primary Outcomes
Primary Outcomes (end points)
Willingness to pay
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Individual-level random assignment of measures to overcome information problem about solar lighting product quality
Experimental Design Details
Not available
Randomization Method
randomization done in office by a computer
Randomization Unit
Was the treatment clustered?
Experiment Characteristics
Sample size: planned number of clusters
150 villages
Sample size: planned number of observations
1500 households
Sample size (or number of clusters) by treatment arms
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
IRB Name
IRB Solutions
IRB Approval Date
IRB Approval Number
Protocol #2016/03/4