Most low light orchids 1800 fc -2000 fc will do well under a 40 watt flourescent. Getting them to bloom might take more power. I believe what you want to try is good. Hanging them will help reduce heat. If you see that you are getting too much light, you can give them shade with other plants, or any other objects. I would go for the 100 watt cfl!
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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