Spectrum King 402+ LED Grow Light

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Spectrum King 402+ LED Grow Light


The Spectrum King LED lighting system is finally here at Holland Hydroponics! When we first had this product demonstrated to us, we were impressed with not only its sturdy build quality, but also the intensity of the full spectrum of light it emits.

  • Spectrum King 402+ LED - HPS Wattage Equivalent: 1000w - Actual Wattage: 440w

Unlike other LED grow lamps on the market, the Spectrum King doesn’t just use a range of Blue & Red light spectrums, which produce the pinkish light we now associate with LED lighting, instead it uses the full spectrum of light that includes spectrums the human eye can’t see, meaning the Spectrum King emits a bright ‘white’ light that mimics natural sunlight, an area all in-door growers aim to achieve.

The Spectrum King LED 402+ grow lamp, although has a 440w rating, it’s the equivalent to running a single 1000w HPS grow lamp, while the 300 Series has a 340w rating and is the equivalent to running a 600w HPS grow lamp. Both versions of the Spectrum King have significantly cheaper running costs, along with generating less heat, meaning grow room temperatures, especially in the height of summer, will be easier to manage and maintain.

This LED lighting unit is also assembled in the USA using domestic and imported components, while the LED’s are supplied by CREE, a company who have been researching and manufacturing LED’s for over 20 years. The Spectrum King also has no moving parts, so unlike other LED grow lamps, there are no cooling fans that can fail, which can lead to LED clusters burning out and with it having an IP65 rating, the Spectrum King is fully protected from dust and jetted water, allowing this sealed unit to be cleaned with a garden hose pipe.


  • Emits a full white spectrum of light to mimic natural sunlight
  • Fraction of the operating costs compared to the equivalent HPS grow lamps
  • LED’s supplied by long standing manufacturer CREE
  • Fully sealed unit with an IP65 rating
  • Assembled in the USA using domestic and imported components
  • 5 year manufacturers warranty


  • Power Consumption: 440W
  • HPS Equivalent: 1000w
  • Recommended Cooling: 1,350 BTUs
  • Net Weight: 10.8 kg
  • Size: 18-1/16” x 14-9/16” x 12-9/16”
Delivery & Returns
Free Delivery
We are pleased to offer free standard shipping to UK Mainland on all orders over £65.00 *Heavy item surcharges are still applicable.
Next Day Delivery
In a hurry for your order? Order before 1 pm Mon - Thurs for next working day delivery *subject to stock availability T&C's apply.
Different delivery address?
Do your goods need shipping to an alternative address? If so, paying by bank transfer gives you the freedom to have them delivered to anywhere in the UK.
Free Returns
Faulty or damaged item? No problem, contact us on 0800 038 7100 or email customer service and we can arrange a free collection.
Plain Packaging
All parcels, no matter how big or small, are dispatched in plain packaging using black wrap that's secured using 'fragile' tape.
How to Pay
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Simply select this option at checkout if you prefer to pay through PayPal. Please note: When paying by PayPal, we can only ship items to the account owners confirmed address.
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Select the option for Bank Transfer at checkout if you wish to receive your item anywhere within the UK. Please use your order number as payment reference.
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Click & Collect
Collect your online orders in as little as under an hour*! Simply pay online, choose your store & collect for free! Available from Manchester & Huddersfield (*subject to stock availability).
Brand Spectrum King
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