![]() ![]() Generally speaking, the higher wattage your grow light is, the higher the PAR output will be. Your plants require a lower PAR output during the vegetative stage and a higher PAR output during the flowering stage this is because flowering plants use more energy and therefore need more food.Īs a general rule of thumb, here are the PAR levels you should consider for each growth stage:Ģ00-400 PPFD – for new seeds or clones and parent plants.Ĥ00-600 PPFD – for plants in the vegetative stage.Ħ00-900 PPFD – for plants in the flowering stage. If you want to measure the exact PAR output of your grow light, then you need to purchase a PAR meter. It is measured as micromoles per square foot per second (μmol/m²/s) PPFD = Photosynthetic Photon Flux Density – This measurement is even more important because it considers both the intensity of the light and the amount of that light that actually reaches the plant. This is measured as micromoles per second (μmol/s). PPF = Photosynthetic Photon Flux – This measures the light’s intensity by determining how many photons per second are emitted from the light. Therefore, in general, you want to choose a grow light with a high PAR output so that your plants are getting as much usable light as possible. In general, more PAR = more growth and healthier plants. The remaining wavelengths will reflect away from the plants, making them pretty much useless to your plant’s growth. However, your plants will only absorb some of these wavelengths to eat and grow bigger. Simply put, grow lights beam out lots of different light wavelengths at your plants. See the graph above! Why is PAR Important? PAR ( Photosynthetically Active Radiation ) is what causes photosynthesis ( your plants growth ) and happens when your plant consumes photons of light wavelengths between 400 and 700 nanometers. ![]()
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