A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.
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    @anthem212 well there are three commands to turn off the output

    vcgencmd
    dpms

    these two turn off the HDMI port, NOT the monitor/tv

    and cec-client

    this turns off the monitor/tv
    IF it supports the cec command(correctly)

    and then you would need a people sensor,
    most use use infrared, as it’s ‘easy’.

    there are modules that put all this together.

    search here for MMM-PIR

    Now to get your speed requirements will be a little harder. I use TV’s for my two main mirror systems. 43 and 55 in.
    one supports cec, the other doesn’t.
    when I turn off the HDMI port on both, they put up a big NO INPUT screen , and power off after 15 minutes.
    that is energy star compliant.
    but you can’t turn them on via software

    if it supports cec, then maybe you can turn off/on via software. mine is inconsistent. always can turn on, but not off
    on is the same as pushing the button, takes 15 seconds, displays the product logo and all that.

    I gave up, and just hide the mm content and leave the TV’s on. the one in the hall I call the nightlight!

    I also use a webcam for motion detection, instead of pir, cause that’s what I had at the time

    as yours is a 4k tv, I’m guessing it supports cec

    install the cec-utils package on pi
    sudo apt install cec-utils

    this also only works on my pi 4. not pi3.

  • Can a "real" mirror be used if modified?

    Unsolved Hardware
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    @cowboysdude the thing is I already have a large hallway mirror someone gave me, so I thought I could add a couple of monitors behind it and make a nice magic mirror.