If this is something you need to do more than once, you might want to look into getting a green light. A green light will not disrupt the dark cycle ... or so I have read.
Just looked on Amazon and Vivosun sells one:
VIVOSUN 19-Bulb High Intensity LED Green Light Grow Room Headlight
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It adds stress when you add light but it should not adversely affect it if it’s a 1 time situation
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