"zxcvbob" wrote in message
...
Steve Peek wrote:
I've been using full spectrum (sunlight) fluorescent tubes for plant
starting for the last several years. Does the quality of that light
diminish with age (use)? I've noticed (this spring especially) the
seedlings seem to be getting more leggy even with only six weeks under
the lights.
Steve


Some wear out a lot faster than others. What *exactly* lamps are you
using? Triphosphor F32T8's maintain about 90% of their luminance for
their whole 20000 to 30000 hour lives. Older technology T12 lamps last
just as long but can lose 50% or more.

-Bob

Thanks, I have 2 lamps. One has F32T8 and the other has F40T12 "sunshine"
bulbs. The largest portion of my plants were started under the F32T8's. The
bulbs have only been used for 4-5 seasons and only for seed starting. The
problem may be with my starting medium. Last year I switched to the
compressed peat pellets. I'm not pleased with the results.

Next years' plan: Exchange the F40 bulbs with F32s and go back to the little
plastic seed trays.