PAR (Photosynthetically Active Radiation) is a measurement process to detect the exact amount of light available for photosynthesis. Detecting this light, especially in the 400-700 nanometre wavelength is crucial, as this is the actual amount of usable light for plants. Using a PAR meter is critical, as this wavelength of light is not visible to the naked eye.
Lumen meters are similar to PAR meters in that, they measure the amount of light emitted from Grow Lights. Lumens are the measurement of light a bulb produces, therefore, the higher the lumen, the brighter the light. For optimum plant growth, 7000 lumens or more is perfect, but atleast 2500 lumens are acceptable. For indoor plant growers, measuring light both by PAR and Lumen meter is acceptable. However, keep in mind that a PAR meter provides a more accurate reading to ensure that plants receive enough light for photosynthesis. At GroIndoor.com, we carry a wide selection of Par and Lumen meters to help you grow successfully. Visit our Grow Blog to learn more about Grow Lights or call us at 866-GRO-INDR to get more information about Par and Lumen meters or any other questions you may have.