TL;DR
Aaron Shady tackled the annoying flickering and whine of low-quality LED light bulbs by designing a custom controller board. Many LED bulbs suffer from these issues due to poor electronic filtering, especially when dimmed, making them less appealing despite their energy efficiency. Shady's project started when he reverse-engineered the original controller of his shelf's built-in LED lighting, discovering that it operated at a low 2 kHz frequency, which produced harmonics in the audible range.