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LED Grow Lights Depot

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 8am - 5pm PST Tues-Fri
 Email Us   Main: 971.266.0352

Frequently Asked Questions

Growing with LED lighting technology

Need assistance choosing an LED grow light?


What are LED grow lights?

LED grow lights are used for growing plants indoors using light emitting diode (LED) technology. LEDs offer many benefits that traditional grow lighting, such as high pressure sodium, metal halide, and fluorescents, do not provide. 

LEDs are manufactured in different wavelengths (ultraviolet, blues, reds, infrared, etc) that provide targeted spectrum control for optimal plant growth. Because plants absorb wavelengths primarily in the blue and red regions of the color spectrum, grow lights do not require a 'full-spectrum' white light for optimal plant growth. LEDs offer plants the exact light they need, which allows them to develop to their full potential and beyond.

Targeted spectrums, in addition to LEDs efficient design, allow better plant growth while cutting energy costs by about 50%. Home-growers, greenhouse managers, or research scientists can save a lot of money and grow better plants with LED grow lights.


How many watts of LED power do I need compared to HID lighting? 

Generally, a 1:2 ratio is best --- 1 watt of LED to 2 watts of HID. Remember, that this is actual LED wattage, not the advertised LED wattage. For example, a 3 watt LED, may only draw 1.7 watts, so the actual output is less than the advertised wattage.

Advertised LED wattage

Another way to look at this is to plan for 40 watts of advertised wattage per square foot of grow space. For example, a light may have 90 x 3 watt diodes. The advertised wattage would be 270 watts (90 x 3 = 270). 270 watts / 40 watts per square foot = 6.75 square feet. Therefore, a 270 watt light will cover 6.75 square feet of grow space. 

Actual LED wattage

You may also use the actual LED wattage to calculate the amount of watts you need for your grow space. In this case, you will want around 32 watts of actual wattage per square foot of grow space. For example, the 270 watt light described above may only draw 157 actual watts. Say, your grow space is 6 square feet. 6 square feet x 32 actual LED watts = 192 watts. Yet, it is best to follow the manufacturer's recommendation because all LED units are designed differently. 


We do not want to confuse you, but wattage should technically not matter when deciding on an LED grow light. This is a carryover from the age of traditional HID lighting. What matters is the PPFD (photosynthetic photon flux density). PPFD 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, and so on.

Related: See exactly how many LED watts are required for your grow space.


How far away should I setup my LED grow light from the plant canopy?

Recommended distances may vary based on the brand, light shape, actual wattage, 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 manufacturers recommendations for their light as they will all be slightly different. But generally, 18"-36" is a typical distance.


Can I veg with HID and flower with LEDs?

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. 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 LEDs only.


Do you customize lights?

Yes! Please contact us to discuss your lighting needs. 


Additional questions

What is your return policy?

Please see our return policy here.


What payment methods do you accept?

American Express, Visa, MasterCard, Discover, Cirrus, PayPal, and Amazon Payments. If you prefer to transfer money via bank account or send a money order, we can accommodate this request.


Will you match competitor's prices?

Of course! Read more about our low price guarantee here.


    Can I order through email?

    Yes! Just send us you order or email us at We offer free shipping for orders ofer $100 and no sales tax for products shipped to US residences/businesses in the lower 48 states. 


    Can you ship to a P.O. Box?

    Yes. However, a residential or business address is preferred when placing an order. UPS cannot deliver to P.O. Boxes.


    How do I cancel my order?

    Contact us as soon as possible if you need to cancel your order. If your order has already been processed, a 15% restocking fee may be charged to your account.


    How long does it take for my order to arrive?

    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, shipping times can range from 3 days to 2 weeks or more depending on when the order was placed, availability, warehouse location, and in some cases, whether the light needs to be manufactured. If you need your light sooner, please let us know before you place your order and we will work to accommodate your needs.