It is obvious a good reflector increase the effective amount of light going into a tank. Bulbs emit light in all directions which means 1/2 the light is going away from the tank. A good reflector sends much of this light back into the tank.
If you are lazy like me and find diy is always more expensive than ready made, take a look at the reflectors (and info about them) here http://www.ahsupply.com/
If you are lazy like me and find diy is always more expensive than ready made, take a look at the reflectors (and info about them) here http://www.ahsupply.com/