Do any of these coating remove wavelengths that interfere with plant growth
or damage skin or plant tissue cells.

I always thought it was impossible to tan underglass, but maybe that is just
lore.

Infra-red and ultra violet are wavelengths are on opposite ends of the
visible spectrum. Do plants utilize these wavelengths? Are they bad for
them in any way?

red and far red wavelengths are necessary for photosynthesis.

When I wrote my question, I was thinking about infra-red but I was reading
about ultraviolet in a brochure. I had just bought a new plastic film for my
greenhouse called "Kool Lite 380 6mil Greenhouse film" It is a silvery
slightly opaque plastic when new. More opaque and silvery than clear
plastic, for sure.

The advertisement says:

reflects green light to reduce heat
reduces greenhouse temperatures up to 15 degrees F.
the warmer the temps, the greater the reduction
84.5% PAR light transmition with 62% diffusion
Blocks UV light up to 380nm for brighter flowers and leaves
removes liver spots.

well not that last one...

Actually I noticed the colors on the flowers where much brighter as soon as
I went in after it got covered. So how does blocking UV light of this
wavelength produce flowers that appear more colorful?

What is PAR and why is it important? I know I am usually the first one to
say "look it up" :-) But it might be nice to get some of this in the
archive, if it isn't already there. I am lazy too.

"TRAINMAN9" wrote in message
...
Actually, the amount and specific wavelengths of light blocked by Low-E
coatings depends on the
chemistry of the coating, it's thickness, and to a lesser degree, which
surface it coated.

Most of the modern spudder coat Low E is on the number two surface and is
made
up of two layers of silver with several layers of oxides to make it
possible to
see through the glass.

Hard coat Low E glass used tin based coatings that were fused when the
float
glass was made. These coatings are typically on the number three surface.
They
do not perform as well as the spudder coated products, have an oil slick
appearance and in most cases do not meet the new Energy Star requirements
for
shading co-efficient or solar heat gain. They typically only block about
55% of
the UV.