Colour for the evening

Warm greys, not cold ones. In the evening, in a flat with one weak lamp, a cold grey looks like a hospital. A warm one looks like a kitchen.

Test I do every time: look at the screen in the hallway of my parents' flat, at 9 p.m., with the bulb my mother bought in 2015. If you can still read the grey text, it passes. Most don't pass. Mother's bulb is a very strict reviewer.