I don't know about how good they are, but I'd say that fluorescents were
more energy efficient that the sodium lamps.

OTOH, I wonder how my metal halide lights from my old fish tank would do
with plants.

"Jeffrey Barker" wrote in message
om...
I recently read in a gardening book that high-density sodium lamps
were much better than any other type of lamp to use as grow-lights.

It seems that high-density sodium lamps are the same type used for
streetlights and home security.

Does anyone know if this is the case? If so, I'd rather drop $20 or
so on a huge lamp that would (I imagine) be useful for all of my
seedlings and plants, since it's so bright, instead of several
flourescent lamps, which need to be kept very close to the plants.

Thanks in advance for any help.

Jeffrey