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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. See the graph above! Why is PAR Important? Simply put, grow lights beam out lots of different light wavelengths at your plants. PAR light is the wavelengths of light within the visible range of 400 to 700 nanometers (nm) which drive photosynthesis (Figure 1). PAR is a much used (and often misused) term related to horticulture lighting.
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Black Dog LED provides all the information you need to know regarding PAR lighting and measurements. See how PAR is important in comparing grow lights.
A PAR meter measures light in the wavelengths between 400nm and 700nm. If I have 50 micromols at the substrate, with the light 20 inches above the substrate, I will very likely have 200 micromols 10 inches higher in the water. I'm still confused about high and low PAR values though.
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There may be more light emitted from a particular source, but your plants don’t make use of all of it – some of it has no real effect on the photosynthesis process. It … PAR (short for Parabolic Aluminized Reflector) bulbs are lamps with "spot light" features, meaning that they provide a beam spread that is typically lower than 45°. Use PAR bulbs when attempting to put a focused beam of light on an object such as in track lighting or illuminating artwork. PAR is essentially a measurement of light emission within the photosynthetic range of 400-700nm. This represents the area of light that plants use for photosynthesis, or to grow. PAR is measured by the amount of micro moles of light per square meter per second. Although PAR is a key measurement, it only tells one part of the story.
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Many halogen spot and flood lights use a parabolic (U-shaped) reflector to collect and reflect the light out the front of the bulb.
PAR spot lights also work great as outdoor security lighting.
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When compared to a BR light, PARs produce a crisper edge. par - WordReference English dictionary, questions, discussion and forums. All Free.
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The wavelengths of photosynthetically PAR lights, or Parabolic aluminized reflector light, are often referred to as Parcans. They are normally a single lamp/reflector unit, that looks similar to a car PPF is the total amount of photons within the PAR range that are is produced by a light source each second. Most common unit is μmol/second.
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