
This is an important consideration for your growing operation.


For example, 300 x 3-watt diodes would be a 900 watt LED grow light. When we talk about wattage inthis article, we are referring to the wattage drawn at the wall, not what the manufacturer states as "LED wattage" - which is typically the product of the maximum LED wattage and the number of LEDs. However, for the purpose of estimation, we will report wattage calculations in this article. Coupled with the correct spectrum for your plant type and phase of growth, PPFD (and spectrum) are the keys to a successful grow. PPFD (umol/j/m2) and DLI is the correct metric for measuring useful light intensity over a given area. PPFD can be more simply thought of as the number of light particles (photons) that fall on a given surface each second. The most accurate way to measure a lights output is in PPFD (photosynthetic photon flux density AKA umol/j/m2). While wattage is a good guildline, it isn't the most accurate way to determine the coverage area of a LED grow light.

Wattage is commonly used to reference LED fixture size, price and coverage area.
