XPGs can handle up to 1.5A while XPE and XTE can take up to 1A. You get better life by running your leds at a lower current. Plus a Cree XPG @700 mA doesn't even begin to produce noticeable heat on my fixture therfore no fans. My tank is next to my couch in my living room and It's silent! Several people running bridgelux @ the max 700mA say the LEDs get quite hot requiring fans to cool them. Fans require more power and extra plug in an already crowded power strip and create more noise. Plus if you have a fan fail you may just overheat and destroy your setup.