What is the best shade's color for the greenhouse for decrease sunlight?Why?

Question

What is the best shade's color for the greenhouse for decrease sunlight?Why?

Answer 1

It is generally white or that odd greenish. Keep in mind one just wants to lower the light levels evenly to keep heat under control. In some cases also one wants to reduce the light levels to accommodate the sales of plants to customers who have an average lower level of light, but that is crop and plant type dependent. White keeps the heat down by reflecting the most but doing it evenly in all spectrum. Colors are absorbed wavelengths and causes heating. If something looks red to you it is because most of the other wavelengths are being absorbed and red is reflected. So that absorption is now turning to heat. Black would be an absorption of all spectrum and would heat faster. The green spectrum is the least used by plants, the spectrum most used center on the UV and IR (on a graph it looks like a 2 hump camel back. Equal reduction of most of the intermediate frequencies reduces heat (which is formed in part from light waves striking an object and changing to a heat frequency) while providing the frequencies plants need. Also good to know, to reflect light to a plant in low light conditions use a gloss white background, as a mirror turns the light frequencies to unusable heat freq's.

Answer 2

sorry

Answer 3

a shade the color of the light you wish to eliminate would block that wavelength. If it appears to be a given color, it is because the cover is reflecting that wavelength.