I got a 30w of this type of light, from a US seller with a plug. It's spectrum is around 5k, but it's pretty nice to look at. I did add a 2-3" aluminum foil shroud to cut down on what Hilde is talking about. I hung it high over a 20L, it should be bright enough to grow whatever plants I want. I'm still setting up the tank though, so I can't tell you how the plants grow, but I do plan to start a thread on here for it.
The 10w version, from what I gathered is around 900 lumens, so mine should be cranking over 2500.