![]() ![]() Radiation sensors included in meteorological stations measure total global radiation in energy units.When getting data from a meteorological weather station outside a greenhouse we have the following problems to approach: #LIGHT INTENSITY FORMULA HOW TO#How to calculate PAR inside my greenhouse with typical data from meteorological weather stations? Meteorological weather stations are located OUTSIDE the greenhouse. However PAR sensors are not as common as radiation sensors, which are usually already included in meteorological weather stations in greenhouses. This is why the best way to measure light will be with the help of a PAR sensor, also called Quantum Sensor. This specific unit will help us to really understand how plants are using light. When measuring PAR we use a specific unit called PPFD (Photosynthetic Photon Flux Density) measured in □mol/ m 2/s. PAR includes just a portion of solar radiation, from 400 nm to 700 nm. In order to understand how plants use light we use PAR (Photosynthetic Active Radiation). Light included in solar radiation includes all wavelengths visible to the human eye. Which is the best way to measure light in order to understand the impact of light in crops? To measure radiation we use energy units like Joules/m 2/s or W/m 2. Only 45% to 50% of solar radiation represents light, the rest of the wavelengths include UV radiation and heat. Solar radiation includes more than light. Solar radiation in Earth covers a range 300 to 1500 nm. To understand light, let’s first separate light from solar radiation definition. What is Solar Radiation or Global Radiation? This article has the purpose to guide you on the approach you can take when working inside of greenhouses to correctly calculate the amount of light your crop is receiving. When we understand light we can make smart decisions to promote the best environmental conditions to promote growth, development and yield in our crops. When working inside a growing system such as a greenhouse or a plant factory system we must have enough knowledge about light management. ![]()
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