Spectrum King LED Grow Lights

In stock online
Standard Delivery £6.95*
We Will Beat Any Price* We Will Beat Any Price*
Standard Delivery £6.95* Standard Delivery £6.95*
Plain Packaging Used Plain Packaging Used
Product Name Qty Price
Spectrum King 300 LED Grow Lamp
Spectrum King 400+ LED Grow Lamp


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 300 LED - HPS Wattage Equivalent: 600w - Actual Wattage: 340w
  • Spectrum King 400+ 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 400+ 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

The Spectrum King LED grow lamp also comes with a 5 year manufacturers warranty and have the following specifications:


  • Power Consumption:340W
  • HPS Equivalent: 600w
  • Recommended Cooling: 1,000 BTUs
  • Net Weight: 9.2 kg
  • Size:18-1/16″ x 12-1/8″ x 12-9/16


  • 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”
Product Details
Brand Spectrum King
Delivery & Returns
Next Day Delivery 12 Noon
Next Day Delivery
In a hurry for you order? Order before 1pm Mon - Thurs for next working day delivery *subject to stock availability T&C's apply.
Different delivery address?
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
Free Returns
Faulty or damaged item? No problem, contact us on 0800 038 7100 or customerservice@hydroponics.co.uk and we can arrange a free collection.

Got a question to ask?

Use this form to submit your question.

Question will be displayed after moderation.