Ideal screen brightness iPad Pro

Hello everyone,
I'm asking you for a practical question about editing on lightroom with an iPad Pro.
I only use my tablet for editing and I would like to know what screen brightness you recommend during editing? (in percent, approximately)

I know that the screen is relatively well calibrated but I can't manage the luminance, so I'd like to know what you think.

I mainly publish my photos on the internet but I would also like to make some prints.

Thank you in advance for your feedback.

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