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Re: Watts and hogwash
> The tank is not free space, and your lamps -- even MH -- are not point
> sources. Light that you manage to get coupled into the tank through the top
> surface stays inside, like a light pipe, until it encounters some
> absorbing/refecting surface.
It has been my experience that even a tank with nothing in it but water and
gravel can be a significant light source for an entire room. Light manages
to come out of it all over the place. The reflectors on most light
situations are not nearly as focusing as a spot light, or even a typical
flashlight, where the bulb is buried way back inside a concave dish.