Cree Reef-White 27W LED-Aquarium-Bulb? Good?

[MoreDakka]

Hey,
So as like most people, trying to save a buck but also trying to make sure it works properly for a reef tank. I ran across this:

http://www.ledpacific.com/products.p...-Screw-Fitting

Which prompted me to search more:

http://www.aliexpress.com/item/2012n...533910553.html

Are these good or no? Will these support a reef tank? It seems that if I can run these in a regular bulb socket I can save a bunch of money that way. Any opinions on these?