Eliza vs Cossack

I had a really good question from a blog reader today about why I recommend the Cossack design.

Look at the instructions for DIY light hat devices, and the photos of both devices, and you’ll see that Eliza is all enclosed, with a few holes at the top, and is lined with reflective foil, whereas Cossack is very open, lots of ventilation, no reflective foil. Continue reading “Eliza vs Cossack”