In the light intensity conversion process, special attention should be paid to changes in the light source. The light intensity is the degree to which the object is illuminated, ie, the ratio of the light flux to the illuminated surface of the object surface. The light intensity in the environment affects not only the respiration of the plant, but also At the same time, it also affects animals. The measurement of light intensity can be measured using a photosynthetic active radiometer.
Different measurement instruments are used to measure, and its unit of measure is also different. Take the photosynthetic active radiometer as an example. The unit of this instrument is μmol/m^2-s, and the general unit of light intensity is Ix ( l lux is the illuminance produced by l lumens uniformly illuminated over an area of ​​1 square meter) or foot cannon (1 foot candela is the illuminance produced by uniform illumination of 1 lumen in 1 square foot area), 1 foot candle = 10.761x. So how do you convert the units that use photosynthetically active radiometers to regular ones?
The conversion of various types of light intensity under the sun is generally: 1 W/m^2 = 250 lux,
1 μmol/m^2-s =? 55.6 lux ,
1? W/m^2 = 4.6 μmol/m^2-s
When using a high-pressure sodium lamp for lighting, the conversion method for measuring the light intensity in the environment is: 1 W/m^2 = 357 lux,
1 μmol/m^2-s =? 71.4 lux,
1 W/m^2 = 5.0 μmol/m^2-s
The conversion factor of the lighting intensity in the environment when using the Philips FL38D is: 1 μmol/m^2-s = 73.86 lux,
1 W/m^2 = 4.43 μmol/m^2-s
The conversion factors for the use of Ascension FL38D/38 and FL-40SBR are different, they are: μmol/m^2-s = 75.13 lux, 1 W/m^2 = 4.42 μmol/m^2-s
FL-40SBR: 1 μmol/m^2-s = 26.97 lux, 1 W/m^2 = 4.84 μmol/m^2-s
In the conversion, pay attention to the change of the conversion coefficient of different scenes and different light sources, and be sure to understand the conversion in the operation, and the conversion result will be more accurate.
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