LED grow lights utilize LED technology to grow indoor plants, including cannabis and other greenhouse crops. LEDs offer many benefits that traditional grow lighting, such as high-pressure sodium, metal halide, and fluorescents, do not provide.
Generally, 30-50% less wattage is needed depending on the efficiency of the LED grow light. More efficient grow lights exude more light while using less watts. Remember, that this is actual LED wattage, also known as wall wattage, not the advertised LED wattage that might be found in the title of the LED grow light. For example, an advertised '1200W' LED grow light might only draw 500W at the wall.
You will want around 32 watts of actual wattage per square foot of grow space. Some LED grow lights require less, while others require more depending on the efficiency. It is best to follow the manufacturer's recommendation because all LED units are designed differently. See this article to learn more.
You shouldn't actually use wattage to determine how powerful of an LED grow light you need. Instead there are other factors that are more important, such as PPFD and footprint uniformity.
PPFD (photosynthetic photon flux density) is a measure of the number of photons in the 400-700nm range of the visible light spectrum that fall on a square meter of target area per second. High PPFD numbers are good, because this means your plant is 'absorbing' enough light to carry out important physiological processes. Keep in mind that there are LED lights that have high wattages, but could have low PPFD numbers due to many factors such as: wide beam/lens angles, large distance between LEDs, an increased height above the canopy, low efficiency, and so on.
The fixture's average PPFD will tell you how much light the unit is putting out over the specified area.
Check out our starter's guide which covers the important metrics for choosing an LED grow light.
Recommended distances may vary based on the brand, light shape, coverage area, beam angle, etc. These factors all affect the Photosynthetic Active Radiation (PAR) that contacts the plants leaves. The best advice is to follow the manufacturer's recommendations for their light as they will all be slightly different. But generally, 18"-36" is a typical distance: 18" for flower and 24" or more for veg.
This is not recommended. Since the plants are used to a particular light intensity and spectrum, switching promptly between lighting sources could shock the plant and delay flowering. It is not unlike growing a plant indoors and placing it outside for the first time without gradually exposing it. It is more assuring to veg and flower with a single spectrum.
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We ship most lights using standard ground shipping. Due to the variety of brands, the lights will ship from different warehouses. After the order is processed, we send most orders out within 72 hours. Once the item leaves the warehouse, shipping times can range from 2-10 days depending on your location within the USA or world. If you need your light sooner, please let us know before you place your order and we will work to accommodate your needs.