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Lighting issue is alway being such a debatable question.
Many factors considering in lighting setup.
Low or moderate lighting may/could be refer to using normal FL light or combination of compact power light (e.g. corallife 10K/20K kelvin, 15watts), actinic lighting (e.g. zoomed actinic light 18watts)
Strong lighting may/could be refer to Metal halide lighting, VHO lighting.