Short night plants, etc
Paul Krombholz' explanation of short night versus long night plants is
entirely correct, and _very well stated._ (Thanks, Paul, it saved me from
looking the entire subject up again. I used to teach this to Extension
Service audiences, but it has been quite a few years and I didn't want to
goof up the explanation.)
To find deep red bulbs or filters -
(a) Try a photo shop. Many black-and-white photographic films and papers used
to be totally insensitive to red light, hence both pure deep red bulbs and
deep red filters for "safe lights" were used.
(b) A 9-watt deep red "compact fluorescent" bulb is available. I got some at
Mail Order Pet Shop. I have NOT checked to see if they would trigger plant
flowering, but they do seem to work pretty well if you just want to see what
the night-active fish are doing.
Hope this helps.