Article from ecogeek.org:

“Although we are big proponents for LED lighting, the US Department of Energy has recently issued a couple of reports warning that many so-called replacement lamps for fluorescent fixtures are not performing at adequate levels. In most cases, fluorescent tubes are still a better choice, providing more lumens per watt than most LEDs. Although LEDs may eventually replace many other lighting options, they aren’t a magic bullet just because they’re LEDs. You should be careful and find out more about them before making the switch.”