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In message , Franz Heymann
writes "Robert E A Harvey" wrote in message . com... All very useful information to bear in mind. I'm not sure about translucent frames being good enough for forcing plants at the start of the year. I may be wrong, but I am under the impression that the translucent material does not necessarily absorb a significant fraction of the incident light, but that it simply scatters it. If I am right, there should be no problem about forcing plants early in the season. If it is the same stuff as I am using (intended for conservatory roof applications) it may transmit around 6% less light due to the internal structure and being double skinned. But it more than makes up for that by providing better insulation. I have known other cacti growers use this stuff to great effect in their greenhouses (and intend to do the same). I'd be a bit less convinced by the 6mm grade. I reckon that may reflect back as much as 10% of the incident light. But even then it may not be a real issue since it is the warmth that encourages early germination. Regards, -- Martin Brown |
"Janet Baraclough.." wrote in message ... The message from Martin Brown contains these words: If it is the same stuff as I am using (intended for conservatory roof applications) it may transmit around 6% less light due to the internal structure and being double skinned. But it more than makes up for that by providing better insulation. I have known other cacti growers use this stuff to great effect in their greenhouses (and intend to do the same). I'd be a bit less convinced by the 6mm grade. I reckon that may reflect back as much as 10% of the incident light. But even then it may not be a real issue since it is the warmth that encourages early germination. In Scotland, conservatory roofs use a triple walled polycarbonate sheet for higher insulation still. You might find that even better for your GH. I have a funny feeling that that is overkill, but I can't prove it..Do you know of a source in which the heat transmission properties of twin and triple walled polycarbonate are compared? Franz |
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