LED Grows?

i was doing some research and i have seen these LED grow lamps and grow rooms. they are are apparently brighter and use less electricity .
has anybody used them, or have any ideas about them, or knows how they are on the light spectrum compared to other lights.

They seem to work well as long as they are at least 50w....I have 3 14w LED's and they are ok for suplimental light but by themselves they suck. I have seen a complete grow with a 60w LED and it turned out well...I want a 300w LED next. I have 2 400w HPS also but since the LED's show promise I can set up a 3rd area...though I may use the 2 4oo's together in the flower room and use the LED's to veg...

dam i really wish i had more room. growing in my closet is really limited