<![CDATA[Artificial light at night (ALAN) is a growing environmental crisis, yet integrating light pollution literacy into science curricula is often hindered by the prohibitive cost of commercial sensors. Addressing this gap, this study examines the DIY CJ’01 photometer as a low-cost, open-source tool for measuring night sky brightness and advancing environmental physics education. Fieldwork across 15 sub-districts in Cimahi City compared the CJ’01 against an industry-standard Sky Quality Meter (SQM). Results demonstrated strong instrumental agreement, yielding a minimal mean discrepancy of 0.16 mag/arcsec². Robust validation via Bland–Altman analysis (bias = −0.157; 95% LoA = −0.465 to 0.152), alongside RMSE (0.218), MAE (0.157), and an Intraclass Correlation Coefficient of 0.832, confirmed its high reliability. Beyond technical validation, embedding the CJ’01 within a Project-Based Learning (PjBL) framework successfully repositioned undergraduate students as active citizen scientists. This instructional design enabled students to translate raw photometric data into baseline sky-brightness maps for municipal use. Ultimately, this experiential approach operationalizes SDG 4.7’s active environmental citizenship, proving that democratized instrumentation can simultaneously serve scientific monitoring and Education for Sustainable Development (ESD).]]>
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