In general fluorescent lamps don't do well in the cold, but I have found
that the few, like the ones you describe that I have tried, did do well.
The other side is they generally do better with long burn cycles, like your
all night cycle so that should not be a problem.
They should save you some money in the long run. I don't use them
outside since I don't use my outside lights all night, only for short
I might add that they seem to fall a little short in real life output in
my opinion, but I suspect they still are more efficient than the standard
If you are looking for the most efficient over all for that use, choose
a sodium lamp. Yellow light and a new fixture required, but it will put out
much more light per watt and will save money in the long run even over the
As for the materials used, yes there are some increases in the energy
used to produce each unit and some nasty materials used, but the energy used
is only greater on a per unit bases not on the life cycle and the amount of
mercury has been greatly reduced in recent years.
Joseph E. Meehan
26 + 6 = 1 It's Irish Math
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