[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

FAQ on lighting is underdetermined

[New to this list, if not to growing plants under water.  Hello,

The FAQ section on lighting gives a formula for computing reasonable
light levels for a planted tank: multiply the surface area by the
distance from the light source, multiply that by a fudge factor, and you
get watt-hours per day. But it doesn't seem to tell what *units* you
express the inputs in. Doing some orders of magnitude in my head, I think
it that inches might work, but is this right?

(BTW the section on suppliers still lists Dupla as if it were available
through U.S. sources.)

Dan Drake
dd at dandrake_com