Recognize the visibility bias
A dark aquarium hides shrimp even when they are moving. A bright tank may make activity easier to see but also cause animals to retreat.
Do not interpret a difference in visible count as a difference in total activity without comparable conditions.
Use a gentle comparison
Observe from the same side and avoid suddenly switching on a bright light. Note the room and aquarium lighting in your log.
A camera with night mode can alter color and detail, so keep original files and treat them as visual aids.
Look at behavior over time
Repeated observations can reveal when your colony tends to forage, but individual tanks vary. Use that routine to plan calm feeding and maintenance.
If movement changes at all hours, check water quality and equipment rather than focusing only on the light schedule.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.