Mine came from AH Supply. Dunno the brand, it's not listed on the box and all I can see on the bulb itself is 55w 6700k.
Everyone seems to talk in terms of watts per gallon rather than lumens which I've always thought was kinda strange. A 55watt bulb will remain a 55watt bulb it's entire life but if light output changes, as it obviously does, then thinking in terms of watts seems like a dumb way to approach lighting for a planted tank.
When one says that 3 WPG is ideal for a planted tank, is that new watts or old watts ?