I've been growing orchids under lights for a little while, and it really depends on placement and the variety. It's pretty hard to give most orchids too much light under 18" flourescents, especially with plants above providing partial shade. If you could post a little more information about the species you've bought, it would certainly help.
Generally, though, I'd get the highest light output you can find and order your plants from the top down, higher light requirement to lower.
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