Probably because LEDs are easier to focus and easier to dim, making them more efficient in many "real world" applications. It is also worth noting that LEDs tend to be more efficient when dimmed.
That said, if you take a look at Linear Technology, you can find a lot of info about the engineering it takes to make fluorescent lighting efficient. Proper inverter design (good waveforms and all that) makes all the difference for the efficiency of a fluorescent lamp.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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