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Saturday, March 28, 2020 Mehdi France

Entry 6 of 17
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...Under the pumpkin polytunnel, it's 74 360 Lux so that's 25% lost cos of the plastic, 2 reasons to explain that difference : that plastic is old , with the UV and the years it becomes less clear, second Reason is Simply, it's dirty : dust, pollen etc... I will clean Inside and outside each tunnel with a Karcher ( wish me good luck lol)
Another factor can change that number, plastic quality. A classic one like Hytithermic is clearer than a Celloclim which is diffusing the light. I did another measurement under tunnel 4 and 5 with that Celloclim plastic : 53 000 Lux, that's almost 50% light lost. In fact, the light is spread in many direction. I hope to reach at least 85 000 Lux after cleaning the pumpkin tunnel. Important detail, I did all those tests at about 2 feet off the soil where the leaves will be.

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