Memorial Day Sale! Mega deals on Grow Light Science, NextLight, Electric Sky, Mars Hydro & more: VIEW DISCOUNTS

Spectrum King LED SK403  - LED Grow Lights Depot
Spectrum King LED SK403  - LED Grow Lights Depot
Spectrum King LED SK403  - LED Grow Lights Depot

Spectrum King LED SK403

  • Availability: In stock.
    • Free shipping in the USA (lower 48 states)
    • Ships discreetly
    • Ships in 1-3 business days
    • Ships with 'Signature Required' at delivery

    The Spectrum King SK403 LED grow light is the perfect solution for indoor growers and gardeners looking to save money and improve their plants’ health and harvest.

    The new generation is here!

    Highly reflective and effective 460W Full Spectrum LED Grow Light. Light spectrum patent No. 10238043, made in the USA. 

    Perfect for plants that are particularly sensitive while only using a fraction of the energy.

    Can be used for both vegetative and flower growth.

    Dual warranty of 3 years for 90% or better of original light output and 5 years on parts and labor.

    *No other company guarantees the light output degradation


    Coverage Area

    The SK403 covers up to a 16 sq ft in flower (4×4 ft) and up to 36 sq ft in veg (6×6 ft).



    The white light spectrum can be used for both VEGETATIVE and FLOWER growth.



    Safety Certified and IP65 Rated

    Rugged waterproof housing for use in wet and humid conditions. Safe for outdoor use.


    Energy Efficient

    The fixture draws half the wattage of an 800-watt HPS while delivering similar light intensity.


    Advanced cooling technology

    Extra efficient heatsinks lower overall ambient room temperature.


    Additional features


    • Full-spectrum 460 Watt LED light made in the USA.
    • Designed for smaller grow sites and sensitive plants
    • Water-resistant housing perfect for wet and humid environments
    • Safe for outdoor use.
    • Great for supplemental Greenhouse lighting.


    Manual Dimmer (optional)

    Reduce light intensity down to 10%.


    Dual warranty

    • Guaranteed to maintain 90% or better light output for 3 YEARS with regular use
    • 5 YEAR mechanical warranty on all parts and labor

    Spectrum King is the only company to guarantee light performance over its lifetime with 3rd party certified data.





    Model/SKU: SK403

    True wattage: 460 watts (dimmable to 10% with dimmer)

    HID equivalent: 800 watt HID

    LEDs: High performance LED diodes

    Beam angle: 120°

    LED lifespan: Up to >50,000 hours

    Spectrum: Full spectrum (near UV to IR)

    Coverage area:

    • Vegetative footprint: up to 6' x 6' (36 sq ft)
    • Flowering footprint: up to 4' x 4' (16 sq ft) 

    Hanging height: 

    • Vegetative: 36"-48"
    • Flowering: 18"-24"

      Daisy chain: No

      Dimensions: 11" x 10" x 9.5"

      Product weight:  14 lbs

      Body Case Material: Die cast aluminum

      Voltage: AC 120V~240V (480 VAC Available upon special order)

      Amp draw: 3.8A @ 120V,  1.9A @ 240V,  0.53A @ 480V

      Work frequency: 50~60 Hz

      PPF - 973.6

      BPF - 1055.7

      BTU: 1,570

      PAR efficacy: 2.1 Umol/J

      Lumens - 62,080.9

      Certifications: IP65 rated

      In the box you'll find:

      • 1 x SK402 LED grow light
      • A 120V or 240V power cord

      Manufacturer's warranty: 3 years on light intensity, 5 years on parts and labor 


      Spectrum King SK602 Review

      Shipping / Cancellations / Returns

      Order Confirmation

      As soon as you place the order, an order confirmation will be emailed to you. This means we have received your order and payment. Payment is captured as soon as the order is placed. In rare cases, if the product is on backorder or unavailable, we will contact you and ask if you would like to wait for the product to become available, switch your product, or have your payment refunded. If the item is available for immediate shipment (1-3 business days) we will submit the order for processing and arrange shipment.

      Order Shipment

      Most products ship within 1 to 3 business days from the date of your order (unless indicated on the product page). Some items take a bit longer to ship since they are built to order (i.e., Timber Grow Lights, ChilLED Tech, Trimmers, etc). We will send you tracking information as soon as it is available. 

      U.S. Shipping

      We are based in Portland, Oregon with warehouses nationwide. We offer FREE shipping in the lower 48 states (sometimes to HI and AK, too) via FedEx, UPS, USPS or other major couriers (product/brand dependent). Expedited shipping is usually available for an extra cost. Contact us before your purchase if you prefer an expedited shipping method and we will get you a quote.

      After the order is processed, allow 2 to 7 business days for the product(s) to reach you if shipped to a U.S. address. We can ship to PO boxes in some cases. We recommend using a street/residential address instead.

      International Orders

      Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or other couriers. Most quotes can be obtained at checkout. If not, please email us to receive a shipping quote for lights shipped outside of the USA. You may also place an order on our online store for items that require a quote and we will notify you via email on the exact shipping costs. 

      Some items/brands can be shipped for free.

      Items shipped internationally from the USA may have VAT, duties, taxes, and/or local charges due at delivery. These charges are the responsibility of the customer and not LED Grow Lights Depot.


      If you need to cancel your order, we recommend reaching out to us ASAP. We charge a 2.15% (credit card / ViaBill), 2.6% (PayPal), 6% (Sezzle) order cancellation fee once the order has been processed (before it has been shipped). We can accommodate most requests, but due to the different time zones and schedules that our warehouses ship from, the cancellation request may not reach the warehouse in time. Once the item has been arranged to ship or has shipped, the package will be treated like a 'return' and is subject to ship-back fees and restocking fees. All EZTrim orders are final and non-refundable or returnable.


      We offer return shipping in the USA if you are not 100% satisfied for any reason. Many brands have a 90-day return policy. See our full Return Policy for rules and guidance on returning an item after purchase and for brand-specific return dates. A 5-25% restocking fee (brand dependent) may apply for returns within the dates of the return policy. Reach out to us for exact return instructions and restocking fees for the item(s) that you purchased.

      If you have any questions or would like to check the availability of an item, you may email us here or call us at (888) 611-9305. Thank you for shopping with us.

      Shop All LED Grow Lights

      Happy grows!

      Erik H.


      Why shop at LED Grow Lights Depot? This is why....

      1) Thousands of Successfully Shipped Orders and Thrilled Customers

      We have been in business since 2014 and are a highly-trusted online retailer offering honest grow advice and top-of-the-line LED grow lights and other grow/harvest/extraction equipment. We have thousands of 5-STAR PRODUCT REVIEWS from satisfied customers.


      2) Small, Family-Run, Veteran-Owned Business

      Founder/Owner Erik H. overseas that every customer is 100% satisfied with their purchase. If something is wrong, we will make it right, guaranteed! Call, email, or message us anytime and we will get back to you in about 1 business day or less (typically with-in minutes or hours during normal business hours). We have your back!


      3) Free Discreet Shipping in the USA 

      We offer FREE shipping in the lower 48 states via FedEx, UPS, USPS, or other popular couriers. We can ship most other products to Hawaii and Alaska for free too.


      4) Reliable International Shipping Available

      Nearly all of our brands can be shipped internationally using FedEx, UPS, USPS, DHL or similar couriers. Go through the checkout process to receive a shipping quote or contact us if a shipping quote is not available at checkout. 

      Items shipped internationally from the US may have VAT, duties, taxes, and/or local charges due at delivery. 


      5) No Sales Tax in Some States

      Forget shopping locally or on other popular retail websites that charge tax. You can save a lot of money when buying though us since we do not charge tax in some states.


      6) 100% Low Price Guarantee

      We strive to ensure that we offer the absolute best prices online. Rest assured that you are receiving the best online price when you shop with us.

      If you find a better price online before or after you order from us (for up to one month), we will match or beat the competitor's price.

      Although rare, we may refuse to offer a price match in which we incur a loss.


      7) Easy Interest-Free Financing

      Finance your purchase in minutes! See our available financing options below:

      Buy what you want today and pay for it over four installments, interest-freeLook for the Sezzle button at checkout. Get approved up to $2,500. LEARN MORE.

      No Payments + No Interest if paid in full in 6 months on purchases of $99 or more. Get approved in seconds! Select PayPal at checkout and pay with PayPal credit or APPLY HERE


      8) Route Package Protection

      Adding Route Package Protection to your order at checkout means that your order is protected against being lost, damaged, or stolen. In the unfortunate instance that you experience one of these inconveniences, you can report an issue with Route and they will work with you to make sure you get the resolution you prefer. LEARN MORE.


      9) We are Authorized Dealers offering a Manufacturer's Warranty

      You will buy confidently from us since only sell new, official products (no used items or clones). All warranties are new are 100% honored through the respective manufacturer.


      10) Safe, Secure, Discrete Transactions

      We accept major credit cards, PayPal, Google Pay, Apple Pay, Sezzle, debit transactions, bank transfers, and money orders. All card payments are processed through our encrypted SSL security processing system. Your identity is always protected.


      11) Hassle-Free Returns

      And just in case your purchase was not up to your standards, we offer return shipping if you are not 100% satisfied for any reason. See our FULL RETURN POLICY for full details.

      Customer Reviews

      Based on 22 reviews
      Jonathan S.
      Awesome light

      I've been using a cheap lights i bought on amazon, and i never will again. I bet I yield 30 percent or more buds with new light.

      Patrick O.
      Great Light - Even Better Price

      Got the Sk402 for a fantastic price. 1000watts in such a small package with good coverage. Can’t beat spectrum king for the size and the quality of light. Thanks Ledgrowlights for the great promo.

      Byron C.

      Amazingly cool running light. Me and my plants are HAPPY.

      What a wonderful light!

      This is the Second spectrum king sk402 that I have purchased and they are both in my bigger 8x8 tent. I was so impressed by the first one, that I bought another one. Like some have said, the light is the closest thing to sunshine. Having the dimmer on the light is a useful feature to me as well. The light is packaged VERY discreetly and packaged well meaning the light is protected during shipment. It's a very powerful light and you may notice yourself keeping it a little higher off your plants if running it at full power.

      Steven C.
      A fine display of brilliance

      Closest thing to Sunshine, plants LOVE it