http://www.icmag.com/ic/gallery/showphoto.php?photo=311109&ppuser=15857
I ran 2 2x4 trays with an 8 lamp t5 over each just once in a winter attic. Things got chilly, but ended up getting 13oz from both trays.
nice and quiet operation is what makes these things stand out in my book. They've definately got there application be it just veg OR a stealth flower rack or something.
sd x og k