Hi, you may want to look at mine here:
http://www.aquaticquotient.com/forum...7-year-hiatus-)
This LED lamp has 3 bulbs of 3W each, and is very bright. It also has telescopic arms which you can adjust the height, as well as how much you want to extend the lamp. It is bright enough for most of the light demanding plants. As you can see from the pics in the thread, the harigrass is growing quite fast and has cover almost every corner of the tank after about 3-4 weeks of planting.
However, this is not cheap though. I bought it at Green Chapter.









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