I had this 48 x 3w Cree for my 2ft cube tank for a month. Sufficient for LPS growth.
http://www.eshinesystems.com/aqua/4g-48x3w-cree-simulator-led-aquarium-light.html
Happy with the purchase. Had a pleasant online deal with Peter.
underwater/macro photographer here, last dive was 2 yrs back before commiting my time to start a family and now a small reef tank to cure the itch.
Underwater captures
Equipment : Nikon D70s, Macro lens with underwater housing and strobes.
it's a type of bubble algae, properly called Ventricaria ventricosa. These are small round green balls that can grow singularly or more likely in groups.