LEDs on a 1.5 gallon

Most of the big box stores carry a desk lamp with a 27 watt 6500K bulb for $20 - $30.
Hampton Bay is the Home Depot branded lamp. This light is what a lot of small tank people use and it will grow plants.
 
Ok, I'm just going to go the lamp route with a CFL. I was thinking of putting in a tall piece of driftwood that extends out of the top of the tank. I have seen some places with driftwood like this and small ferns growing on the emersed wood. Does anyone know what species of ferns could be grown like that?
 
I ended up going with a desk lamp with a 13 watt 6500k CFL
 
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