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Spectrum King LED SK603  - LED Grow Lights Depot
Spectrum King LED SK603  - LED Grow Lights Depot
Spectrum King LED SK603  - LED Grow Lights Depot

Spectrum King LED SK603

  • 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 SK603 is a 656W Full Spectrum LED Grow Light with a patented light spectrum (US patent No. 10238043) made in the USA.

    Replaces 1000W Dual-Ended MH/HPS Lamps, and designed specially to be used in both indoor grow facilities and greenhouses.

    Nationwide compliant.

    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 SK603 covers up to a 25 sq ft in flower (5' × 5') and up to 64 sq ft in veg (8' × 8'). That's more square feet of coverage than any other LED grow light in the market with proven results.


    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 SK603 produces less heat than most competitors and saves over 43% on energy when compared to dual-ended 1000-1200 Watt HPS bulbs! Cool up to 5.5 SK603's with just 1 ton of AC.


    Advanced cooling technology

    Extra efficient heatsinks lower overall ambient room temperature.


    Additional features

    • Full-spectrum LED light made in the USA
    • Water resistant housing safe for wet and humid environments
    • Safe for outdoor use
    • Great for supplemental greenhouse lighting
    • Remote Power System Compatible (480VAC)
    • Additional heat pipes for better thermal management
    • New and improved heatsink with smaller vertical profile
    • Cool up to 5.5 SK603’s with just 1 ton of AC!
    • Brightest LED lighting fixture in the market today



    Manual Dimmer

    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: SK603/sk-603

    True wattage: 656 watts

    HID equivalent: 1000W Double Ended MH/HPS Lamps

    LEDs: Full spectrum LED

    Beam angle: 120°

    LED lifespan: >50,000 hours

    PAR efficacy: 2.2 umol/j

    PPF: 1495 umol/s

    BPF: 1,623.2

    Lumens: 115,700

    Spectrum: Full spectrum (near UV to IR)

    Coverage area:

    • Coverage Area Veg: 8’ x 8’
    • Coverage Area Flower: 5' x 5'
    Hanging height: 
    • Veg: 48"-60"
    • Flower: 30"-42"

    Daisy chain: No

    Shipping size: 24" x 12" x 11"

    Dimensions: 22" x 11" x 5.5"

    Shipping weight: 24 lbs

    Product weight: 20 lbs

    Body Lens: Glass

    Body Case Material: Die-cast aluminum

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

    Amp draw: 5.46A @ 120V  2.73A @ 240V

    Work frequency: 50~60 Hz

    BTU: 2,239

    Certifications: IP65-rated, DLC listed

    In the box you'll find:

    • 1 x SK602 LED grow light
    • A 120V or 240V power cord
    • Eye-hooks for hanging

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


    Specttrum 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 10 reviews
    Brighgtest light for its size hands down

    Been using Spectrum King lights for years. This new one is the King, Crystal production is much higher than with HPS. Wish I could afford more.

    Rick S.
    SK602 LED Review

    So far, so good, we’re only 2 months into 1st grow with our new lights

    Best LED I haver used

    I've grow the same strain seed in two different tents using Spectrum King LED SK602 in one and Advanced LED in the other.
    The SK602 got the plants growing more rapidly, greener and more buds by far.
    I will be buying more of these lights to replace the Advanced LEDs as they die off. I've not been getting any support from Advanced LED for replacement parts so I'm being forced to find other light sources.
    Great quality, well built and they work!
    Thank you

    Albert L.

    Wonderful and super powerful light that produces top quality harvests and with the dimmer it becomes even more versatile.

    Ronald B.
    4x8 tent

    Have been very impressed with the performance of this light, Have been using with a light rail mover.