Great idea for a vid! Anytime you have a video suggestion, by all means let us know. We want to cover the products and topics hobbyists are most interested in.
As long as it is a 54W fixture, the bulb itself will give you the same output. However, ATI fixtures have higher par due to the fixture design as well: better cooling, better reflectors, etc. These same advantage would influence the performance of the E5's as well.
I'd be interested in PAR readings if you guys decide to make a video. Would be nice if you guys could compare a 6 bulbs ATI lamp setup vs a 6 bulb E5 setup.
Any info on the led's being used? I would trust them if they had 3w leds, but if they're using 1w or .3w they would just be like a Marineland fixture with a sleeve over them.