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UV Light vs. Mold: The Ultimate Battle

CWSF · 2026 Health & Wellness

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Overview

This experiment was created to test which types of UV light reduce the most amount of mold growth. It was hypothesized that if the mold was surrounded by UV-C light, the light with the shortest and most powerful wavelengths then the mold's surface area would reduce the most. Because UV-C light has the shortest wavelengths, and therefore a higher energy level, it will penetrate mold cells and stop any mold cells from reproducing. While the light with the shortest wavelengths did the most damage by a considerable amount proving our hypothesis correct, there was data that was collected that was unexpected.The mold under no light actually reduced more than the mold exposed to the UV-A light by a small difference of about 1%. According to our research, this was unexpected because mold typically grows best in dark conditions. Overall, the data and observations did fully support the hypothesis.

Awards (1)

  • Selected for CWSF 2026

Competition history

  • CWSF 2026 Health & Wellness

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