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Spectrum King SK400+ Full Spectrum LED Grow Light

By Spectrum King
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Price: 699.00
Out of Stock.
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Product Description

 The Spectrum King SK400+ has been replaced by the all new SK402.

The Spectrum King SK400+ is a 440 Watt Patent Pending Full Spectrum LED Grow Light that is proudly made in the USA.

It easily replaces 1000W MH/HPS Lamps while reducing power consumption by nearly 60% and producing substantially less heat.

This full spectrum light can be used for both vegetative and flowering growth without the need for switching modes or providing supplementary light.

Features high performance CREE LED chips with intense penetration deep through the top layer for optimum coverage.

It has a giant coverage area:

Flowering: 16 sq ft (4 ft x 4 ft)

Vegetative: 36 sq ft (6 ft x 6 ft)

More Square Feet of Coverage  than any other LED Grow Light in the market with proven results.

Safety Certified and IP65 Rated. With a specially designed rugged waterproof housing. The SK400+ is fit for use in wet and humid conditions and fit for indoor and outdoor use.

The SK400+ has extra large efficient heatsinks to lower overall ambient room temperature.

Nine-foot power cord and one large eye-hooks for hanging included.


90° reflector:

Covers 4’ x 4’ area at 18” above the canopy for normal plants and should be placed up to 24” above the canopy during flower for sensitive plants. It can cover up to an 8’ x 8’ area for vegetative plants at 4’ above the canopy.

The 400+ 90° reflector unit is meant for plants 2.5’-6’ tall during flower and is recommended for ceilings that are 8’-11’ tall.

Spectrum King SK400+ 90 Degree Reflector

120° reflector:

Covers 5’ x 5’ area at 12” above the canopy during flower for normal plants and should be placed up to 18” above the canopy for sensitive strains. It can cover an 8’ x 8” area in vegetative plants at 3.5’ above the canopy.

The 400+ 120° reflector unit is meant for plants 18”-42” tall during flower and is your best choice for ceilings under 8’ tall.

Spectrum King SK400+ 120 Degree Reflector

Add Ons

Manual Dimmer

Reduce the power down to as low as 10% power for more control when needed.


Comes with a dual warranty:

1) Spectrum King SK400+ LED Grow Light is guaranteed to maintain 90% or better light output for 3 YEARS with regular use

2) 5 YEAR Mechanical warranty on all parts and labor.

Safety Certified

Spectrum King LED Grow Lights are recognized by the international standard that designates products fit for use in wet and humid conditions. Very few companies that make grow lights qualify for this certification. These lights are designed with IP65 ratings in mind as most indoor gardens and commercial greenhouses have wet and humid environments creating challenges for gardeners. The light's IP65 housing make clean up easy and you can foliar spray your canopies without worrying about damage to the lights internal components.


Spectrum King SK400+ Spectrum

Important Stuff

Grow Area (veg)

Up to 6 ft x 6 ft 

Ideal Height From Canopy - 90° (veg) 42" - 54"  
Ideal Height From Canopy - 120° (veg) 30" - 42"
Grow Area (bloom) Up to 4 ft x 4 ft

Ideal Height From Canopy - 90° (bloom)

18" - 24"
Ideal Height From Canopy - 120° (bloom) 12" - 18"
HPS/HID Equivalent 1000W HPS/MH Lamp
Initial µmol (*90˚ Reflector)  1950 µmol

Power Consumption 

480 Watts
LED Lifespan > 50,000 hours
Voltage 110-240VAC
Frequency Range 50~60Hz
Amperage Draw @ 110V – 3.6 A , @240V – 0.91 A
Recommended Cooling  1350 BTU
Light Beam Angle 120 or 90 degrees
Body Lens Glass
Body Case Material Die Cast Aluminum
Dimensions (90° Reflector) 13 in W x 17 in H x 11 in D
Dimensions (120° Reflector) 13 in W x 13 in H x 11 in D
Weight (90° Reflector) 30 lbs
Weight (120° Reflector) 25 lbs


Order Confirmation 

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase.

As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment.

If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail.

If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.

Order Shipment

If your order is stock and we process the charges to your credit card, it will ship within five business days from the date of your order.

The one exception is our grow cabinets. These are made to order right out of California and can take 2-3 weeks before they ship.

Just hang tight, they're worth the wait :) 

We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address your provide when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at

Your privacy is important to us, so we offer discreet shipping on all orders. We ship in plain, unmarked packages via Fedex, UPS, and USPS. For larger shipments such as our grow cabinets we ship via freight and will provide you with a Bill of Landing and tracking information. 


Please inspect the packaging of your item(s) when they arrive, if you notice any damage you should make note of it when signing for delivery. If your item(s) do arrived damaged, please send photos to and we will process an insurance claim on your behalf.

Cancellations & Refunds

All orders cancelled after 48 hours are subject to a $20 administration fee, whether or not your order has shipped. If your order has shipped, you (the buyer) will also be responsible for actual return shipping charges. Refunds will only be issued to the original credit card that you use when placing your order. 


If you are unhappy with your order for any reason we can help you with a free return within 30 days of receiving the item. You will need the items original packaging to make a return, so please keep it!

Just send an email to and we will take care of you. 

Shopping online is great but it can be hard to know if you’re getting the best deal.

From the the moment you click "Add to Cart", to the day your order arrives at your door, we want your experience with us to be completely stress-free.

If you’re worried about finding a better deal online, now you can relax.


Here's our promise:

If you find another store online that is offering a better price any time within six months of making your purchase, we will cover the difference. 

That’s right, we will send the money straight back to your pocket. If you buy one of our products for $100 and find it online for $90 just send an email to info@allgreenhydroponics with a link to the better priced product and we will take care of it from there.

You’ll get your $10 back right away. 

We offer this price match guarantee because we want you to be able to shop with confidence and not have to worry about if you’re getting the best deal online. With us, you always are. 

There are some requirements for us to price match:

  • We will only price match after you’ve placed an order for the product to be matched.
  • This is not valid for products on sale or offered with other promotions.
  • The product will only be price matched against other online retailers that do not have physical store locations.
  • The competitors website must show the price matched product as in stock.
  • Discount and auction sites will not be price matched (i.e. ebay, groupon, overstock).
  • Only Authorized Retailers of the product will be price matched.
  • Price matching is valid for the item price plus shipping costs, sales tax is not included.