This myth is not true for fluorescent, and especially not true for LED bulbs.
"The energy consumed to start a typical lamp is the equivalent of 2 seconds running time, so it is wrong to say it takes a lot of power to start them. It is true there is a current surge but this takes place in less than one-eighth of a second and because it happens so quickly it takes very little energy.
It is true that switching on/off fluorescents reduces lamp life but lamps are designed to be switched on/off up to seven times a day without any effect on their life." https://www.environment.admin.cam.ac.uk/resources/mythbusters-facts-top-tips/fluorescent-myth
"The operating life of a LED is unaffected by turning it on and off. While lifetime is reduced for fluorescent lamps the more often they are switched on and off, there is no negative effect on LED lifetime."
I'll reluctantly admit that there's an argument for leaving incandescent bulbs on continuously, or starting them gradually each time with a dimmer switch. The in-rush of current can damage and eventually thin the filament leading to failure.
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