Research says that most users won’t notice a gradual 30% drop in light levels; accordingly the industry has defined L70, the time at which the output has dropped to 70% of its initial level, as an endpoint for measuring LED bulb lifetime. Based on how it’s estimated, this measure is typically stated as B50-L70, the point at which 50% of an initial sample of bulbs will retain 70% of their rated output.
$ chrome --headless --disable-gpu --repl --crash-dumps-dir=./tmp https://www.chromestatus.com/
This is an animation of traffic flows simulated on 30 different kinds of four-way junctions, from two roads intersecting with no traffic lights or signs to complex stacked interchanges that feature very few interactions between individual cars. It was recorded in a game called Cities: Skylines, a more realistic take on SimCity.
The camera was developed for military use, has an effective ISO rating of 5,000,000, and has a comically long name: “X27 Reconnaissance Day/Night high Fidelity true real time low light/low lux color night vision Imaging Security / Multi Purpose camera system”.