LEDS are replacing other outdoor lights with no thought to how bright they are. I was at at campground where they glared in my eyes during the day. Lit up everything at night. No thought to placement or aim.

Whatever happened to the good old fashioned lamp shade? Light up whatever it is but hide the welding torch-like source! Now we need to wear our sunglasses at night like the song says!

https://arxiv.org/abs/2405.13188

Topological polarons in halide perovskites
Jon Lafuente-Bartolome, Chao Lian, Feliciano Giustino

Halide perovskites emerged as a revolutionary family of high-quality semiconductors for solar energy harvesting and energy-efficient lighting. There is mounting evidence that the exceptional optoelectronic properties of these materials could stem from unconventional electron-phonon couplings, and it has been suggested that the formation of polarons and self-trapped excitons could be key to understanding such properties. By performing first-principles simulations with unprecedented detail across the length scales, here we show that halide perovskites harbor a uniquely rich variety of polaronic species, including small polarons, large polarons, and charge density waves, and we explain a variety of experimental observations. We find that these emergent quasiparticles support topologically nontrivial phonon fields with quantized topological charge, making them the first non-magnetic analog of the helical Bloch points found in magnetic skyrmion lattices.