I can speak from direct experience with your second option. I have 3 of the 45W panels lighting a setup based on a 48" x 18" aquarium. The first orchid I ever bloomed was a Brassavola Little Stars that was about 18" above the plant. I revamped the plants but here's a pic of it currently. I did add 2 9W led warm white floods to give a more natural appearance.
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