They're just hitting the markets now, but so far their performance has been less than stellar (or so I've read). They say they only perform as well as a 400W SE.
CoralVue makes a 400W DE setup:
http://www.premiumaquatics.com/Merch...Coralvuehalide
and so does Ice Cap, but I don't think they are marketing them yet.
You might also consider the new Ice Cap Spot Pendants which I have heard some good things about
:
http://www.premiumaquatics.com/Merch...de=icespotpend