I was leaving Home Depot today and something caught the corner of my eye as I was leaving the store.... Phillips is offering PAR 38 and PAR 30 LED bulbs!! Looks like there is 8 LEDs per bulb of the 2 watt variety. Color temp is a "cool white" of 4200.
They also made an OUTDOOR version of the PAR 38 bulb, which would be interesting for aquarium usage.
Looks like some DIYer needs to experiment with buying these and swapping in some Cree, Edison, or Semi LEDs.