Building a realistic artificial sun (for dark winter days)

What this video covers

DIY Perks builds a realistic artificial sun for dark winters, using a powerful water-cooled LED, a satellite dish reflector for near-parallel rays, and a scattering layer to mimic the blue sky. The video explains the optics behind why most lamps do not look like sunlight and shows the build and its results.

Why it surfaced in Hacker News

Whenever HN discusses seasonal affective disorder, myopia, or bright home lighting, people point to this as the most convincing buildable example of sunlight-like illumination.

Recommendation context

Short excerpts from positive mentions. Open the source to read the full Hacker News discussion.

“Goes into the science of what it takes, and the results are really stunning.”

“The result is quite stunning. I've never seen anything like it.”

“here is a detailed video of an incredible artificial sunlight rig build.”