Secret supermarket trick? Aldi explains the blue supermarket light. Many theories on Reddit: What is the blue light on the ceiling of the Aldi store doing? A customer discovered a special ceiling light at Aldi and shared a photo of it on the Reddit platform.
One comment simply reads: “It glows blue.” Another user writes as an explanation: "It's blue light." Sometimes the simplest answer is actually the right one - even if the commenters may have originally meant it as a joke.