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a firmament greenhouse proposal - Page 6

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Posted by Toby Anderson on August 1, 2004, 12:26 am

Yes, plants need light, but apparently they are selective in which
type of and how much  light they need.  After my signature below, I
list a couple snippets from 2 articles.

First.  -----the type of light plants like---

The light spectrum looks like this:

above 700nm: Infrared invisible light (too much makes plants wilty and
400 to 700nm: Visible light (including Red and Blue which plants like)
below 400nm: Ultraviolet invisible light (too much makes plants

The 3 inch deep water in the water-roof greenhouse is such that it
filters out 37% of the Infrared light, but passes everything else.

Too much Ultraviolet (UV)  light makes plants stumpy and can be
harmful. Several glass/plastic manufacturers have glazing with UV
filters/retarders in it.

Second, how much light plants like.

There are 'tables' which list how much light each particular plant
likes. The article below, says between 4000 to 7000 angstrom.

The 30 year data from NREL
(http://rredc.nrel.gov/solar/old_data/nsrdb/bluebook/data/23169.SBF )
 says that at 1pm in June in Nevada, there is about 110 klux-hr

Here's one example:
Gaura Pink Fountain
Provide a minimum of 5000-6000 foot candles/ 53,800-64,600 lux

SO, in this case, I could shade or reflect  100-60/110 = 36% of the


Since plants use energy between 400 and 700 nanometers and light in
this region is called Photosynthetically Active Radiation or PAR, we
could measure the total amount of energy emitted per second in this
region and call it PAR watts

Ultraviolet Photography
by Ivan Mikk  Czech
This article was published at reduced form in Czech journal Photo Life
IV 23 (3/2001) June/July 2001
as visible light is characterized the radiation in the wavelength
range between 400-700 nm. When the light (radiation) have a higher
wavelength (above 700 nm) then this light is named infrared (from this
is derived infrared photography). UV range starts when the wavelength
is below 400 nm.

http://www1.agric.gov.ab.ca/ $department/deptdocs.nsf/all/webdoc1380?opendocument
Agriculture, Food, and Rural Development..  Alberta Government
House Plants: Artificial Light
Only when a plant's entire light requirements are being met by
artificial sources must special lighting provisions be made. Plants
absorb red and blue light, both are used to control photosynthesis and
various aspects of plant growth. Red light (6000 to 7000 angstroms)
mainly controls maturation, and flower and seed production; it is
particularly important to flowering plants. Used alone, red light will
make plants grow tall and spindly. Blue light (4000 to 5000 angstroms)
chiefly controls leaf development; plants grown under blue light alone
tend to be short and stocky, with thick stems, dark green leaves and
few flowers. Ultraviolet rays are used only in small quantities and
can easily damage plants.

Incandescent lights (the round bulbs normally used in the home) can
supplement natural daylight for foliage plants with low light
requirements, but they do not provide enough light to meet and needs
of flowering plants. They give off a large amount of red light and
infrared radiation, most of which becomes heat. This causes cooling
problems and burning of leaves. Because the light source is
concentrated in a small area, light distribution is likewise
restricted to a small area.

Posted by Karel Horemans on October 1, 2004, 12:13 am
oops url helps
have look here... water in bubble format... he has it working

http://www1.agric.gov.ab.ca/ $department/deptdocs.nsf/all/webdoc1380?opendocument

Posted by Karel Horemans on October 1, 2004, 12:00 am
 have look here... water in bubble format... he has it working

Posted by Steve Krug on August 3, 2004, 1:57 am
 A fellow by the name of Riley (sp?) built several of these greenhouses up in
Detroit Lakes, MN in the early eighties...

Steve Krug
Designer of Engineering Systems
S & K Design and Services

Posted by Toby Anderson on August 3, 2004, 9:17 pm
Do you know how I can find out more about this?

(I tried an internet search to no avail....)


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