When you can get LED's that point in the right direction to begin with, these don't make much sense. This is a replacement for an incandescent light bulb, so it's designed to throw light in all directions. Thus, most of your light, your going to have to try to reflect back to the tank, during which process a good % will be lost. 450 lumens isn't much to begin with.
They do make mogul based LED "spot lights" where all the led's are facing the right direction. they don't have tremendous wattage, but it should be a much lower number of diodes(than the corn cob) which typically means you will get greater depth penetration.