what led to buy

A few weeks ago i found a thread about some led where to buy and witch where good for a ats
I can't find it anymore

http://algaescrubber.net/forums/show...-led-grow-bulb

http://www.ebay.co.uk/itm/12W-40W-60...item3a83d789b3

thanks just wat i need.

can you thell me if i take the 40 w of these how big can i make the size for 1 side i want to make a slide ats not a flat one just a litle bit tilted down in the sump.. I hope you get the idee

thanks