Red & Far-Red Filters
gd3 at UMAIL.UMD.EDU
Tue Dec 2 10:02:53 EST 1997
Red filters are relatively easy to come by, but remember that not all
are the same. I use Roscolux #27 Medium Red celophane that I obtain
locally from a theatrical supply company called Kinetic Artistry in
Takoma Park, MD. Make sure that you use a fluorescent light source
(cool-white is fine) since these are all cut-off filters and all
transmit in the far-red. Do not use Incandescent bulbs !!
Far-red filters are the real problem. The best filter is a Plexiglas
filter that was made by Westlake Plastics in Lenni Mills, PA called
FRF-700. Unfortunately, they no longer manufacture it and have no more
in inventory. A suitable alternative is to combine the red filter
described above with a blue filter (Roscolux # 385 - Royal Blue). In
thism case you want to be sure that you have an adequate supply of
far-red, which cool white does not. If you wish to match the red
filter, use a wide spectrum gro-lux or vita-lite fluorescent source. If
you want maximal far-red energy, use an incandescent source, but be
careful of the amount of heat. You can very easily melt the celophane
and start a fire.
These filters can be obtained from Rosco Laboratories, Inc., 36 Bush
Ave., Port Chester, NY 10573. Sorry, I don't have a phone or e-mail for
them, but they might have a web site.
Hope this was helpful.
Gerald F. Deitzer
Alex Enyedi wrote:
> I am looking for the name of a supplier(s) of far-red and red filters
> for use in my Plant Physiology class next semester. I have checked both
> the Carolina and Wards catalog but nothing was available. If you can
> help me out, I would appreciate it.
> Thanks in advance.
> Alexander Enyedi
> Dept of Biological Sciences
> Western Michigan University
> Kalamazoo, MI 49008
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