I agree with others that there is no one “perfect” color, but -yes - leaf color can change. Light levels are one significant driving force (and more is not necessarily better for deep understory plants like phalaenopsis).
I absolutely disagree with the comment that shiny leaves reflect sunlight. Dull-appearing leaves are common among plants grown with relatively high mineral content water. Switch them over to RO and don’t overdo the fertilizer and many of them will become noticeably shinier with time.
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