Fan holder on heat sink led

This is my growlamp build with 20w red led and 10w blue led, a small fan mount on it, can easily cool down to 30° Celsius.
The heat sink used was bought on eBay :
http://www.ebay.fr/itm/181350965625?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT