If online, you'll likely have to test out buy and return a few (could get expensive because it's technically not faulty so return shipping would be on you).
Now, to find a monitor that suits your needs, it's unfortunately going to be "trial and error." Go into a store and test them out. Your computer can't make it go any lower. Your MacBook (or any laptop) can send control signals to dim or brighten the monitor but when it reaches it's lowest point, that's as far as it goes. The fact that it doesn't go to "zero" (or low enough for your particular needs) is due to the design - there may be a technical reason like the LEDs that the manufacturer used may only work properly within a certain voltage range.
For simplicity, think of it like the "volume" control for audio, but instead of sound, it handles light. The amount of lumens a display puts out (how dim and bright it goes) is totally dependent on how the manufacturer designed and built it. The range of brightness of a monitor is dependent on what the manufacturer designed and is irrelevant to the computer (Macs and PCs) attached to them.
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