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Just in case it’s not clear for Americans, those temperatures are in Celsius. But you can pretty much interpret them as one dot low, two dots medium, or three dots high on your machine (double check user manual to be sure). More dots equals higher temperature.
I never use anything but cold, have done so for 30+ years. Never have a problem.
The options hot/cold are not present on washing machines in Europe, and instead you get these temperature gradings, generally they go from 30 °C to 90 °C. All water is collected from the cold water line and then heated inside the washing machine itself.
Since 30 °C is the lowest the machines usually go, we can't even wash in cold water even if we want to. Kind of a pity.
My washing machine has a wheel to select multiple, heat-specific programs but also has a "cold" switch for other programs. I seldom use the heat specific ones, unless I'm particularly interested in a hot wash.
So I guess that the mileage may vary by country (I'm in Spain) and how old a washing machine is (mine is quite old).
Mine is cold, cold/hot, hot. Actual temp depends on the water heater setting.
That’s really all I do for lights or darks
One dot is 30°C, and extra dots add 10°. Except for the 6th one, that adds 25°. Yes, perfectly clear.