LED Grow Light Wattages

How many watts should a grow light be?

This will vary depending on lighting type, but for LED grow lights, a good estimate is 40 watts per square foot of growing space. It is important to read the specifications of your exact light to be sure. For example, the Covert C300W 100 Watt Full-Spectrum LED Grow Light can cover a vegging area of 4' x 4', and a flowering area of 3' x 3'.

How close can LED grow lights be to plants?

This will depend on the wattage of your LED grow light, and you should always verify with the manufacturer of your grow light to be sure you don't burn plants. Since these grow lights put off less heat than typical HIDs, some growers believe they can be placed closer to the canopy of the indoor garden, but this is not the case. The strength and intensity of LED grow lights exceeds others, and thus they actually should be further from plants to prevent bleaching. Be sure to watch for stress symptoms on top leaves of the canopy, as this is a sign grow lights are too close. Here is a guide if you are unable to get information from the manufacturer:

  • 100-240w-12-15"
  • 240-400w-16-30"
  • 400-550w-20-30"
  • 550-850w-24-26"
  • Over 900w-26-42"

If you want to be sure a specific light has sufficient wattage for your indoor garden or grow tent, reach out to our experienced growing staff at 888-815-9763 and let us help you pick the best light! If you want to learn more about light emitting diode technology, check out our full breakdown on LED grow lights.

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