Just using one unit of this cheap leds without optic:
http://www.ebay.com/itm/DIY-3-x-3W-R...ht_1564wt_1204
It is labeled 3x3W , but i think they are mutch less than that. Maybe it is 3w leds, but i dont think the unit of 3 pieces use more than 3w tougether.
Dont think this leds are ideal beacuse of the leds config on the aluminium plate. I am going to get something else for my nexst scrubber.
Jnad