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I wonder if this is how all m21 24Macs look like when in dark room?
Has anyone else seen similar?
 
This is the consumer grade machine. The pro machine isn’t out yet. Of course it exhibits bleeding when forced to.
 
Do we really need this thread? I have a suggestion for the OP. Use your iMac as you would normally use it? How do you find the display when normally using your iMac?
 
Better off getting a Hackintosh or Mac Mini M1 and connecting to a 48" LG CX or C1 OLED. You'll never go back to LCD.
 
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This looks quite normal for a video of an IPS screen in a dark room
Quoted for truth - with the modification that this looks normal for an edge-lit IPS-screen. If you use mini-LED backlighting, you avoid this.
Note that with mini-LED you will still be able to film/photograph glow with a good camera, but the ability of the eye to discern light levels depends on angle of view. At smaller angles the high intensity light blinds the eye to nearby low-light contrast. Thus micro-LED or OLED will look better when filmed with a good camera, but it may not matter to the eye, depending on how densely the backlight LEDs are distributed. YMMV.

As has already been said, having a completely black screen with the backlight brightness pulled up really isn’t a normal use case. Or even a use case at all. The phenomenon is mostly visible when watching dark scenes in movies in a darkened room.
 
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