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Item#: 9SIA1B00B55728

Earth Worth 400W Electronic Digital Ballast For HPS or MH 400 Watt Grow Bulbs

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  • Overview
  • Specifications
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What makes Earth Worth ballasts so special? Quality and Performance! Earth Worth only supplies the highest quality hydroponic digital ballasts and systems. We have searched the world over and partnered with a factory which utilizes the most advanced lighting components which results in a high performance, long lasting, and versatile ballast that will yield superior crops and be around for years to come. Our ballasts were specifically designed to grow healthy, high producing plants across each phase of their growth cycle. These ballasts are found in hydroponic research facilities around the country and are used professionally in agricultural research, biotechnology, and pharmacology. If fast lamp ignition, constant lamp voltage, flicker free output, premium cooling fans, and a high efficiency ballast are on your list of "must haves", then the EW-400 ballast is for you.

The EW-400 Ballast is constructed of the highest quality electronics to exacting quality control standards to ensure you years of trouble free service. Our high performance ballasts are electronically optimized for growers who use both High Pressure Sodium (HPS) bulbs and Metal Halide (MH) Bulbs 400 Watt Grow Light Systems. The electronic footprint provides constant wattage which will extend your bulb life and virtually eliminate bulb flicker. Constructed of high grade aluminum, it will keep you components safe and cool while maximizing crop yields. Earth Worth hydroponic products are created by growers FOR growers. And we stand behind every product we sell 100%.

What is Included:

  • Earth Worth 400 Watt Digital Ballast for HPS/MH Bulbs
  • Operating Manual


  • Rated Power: 400 watts (High efficiency)
  • Bulb Compatibility: 400 watts High Pressure Sodium Lamps OR Metal Halide Lamps
  • Provides Cleaner & Constant Power to Bulbs, Maximizing Life and Crop Yield
  • Quiet Operation Reduces Operating Noise
  • Components are shielded to protect against R.F.I. (Radio Frequency Interference
  • Working Voltage - 120
  • Interior Fan saves Energy and Lowers Operating Cost
  • Built-in standard reflector interface
  • FCC / CE Certified
  • Energy saving and environmental friendly
  • Stabilize input power and output luminous flux
  • Reduce wastage and improve usable efficiency of power supplyequipment capability
  • Specified Frequency: 50/60Hz
  • Size: 12in. x 4-1/4in. x 3in.
  • Power Cord: 8-1/3ft. 3 Prong Power Cord (US standard plug)

Why buy a digital ballast?

Efficiency. A Digital Ballast enables the electrical current to conform to the optimal levels of performance for the bulb being used. Another advantage is the consistent light and less flicker--flicker results in premature bulb burnout.

Cost Savings. Digital ballasts are more efficient. Even thought they cost a few dollars more upfront, the long term benefits far exceed the investment cost.

Size/weight. Digital ballasts are much smaller, lighter, and have sleeker designs. They run quieter, run cooler, and have been known to extend bulb life by as much as 30%.



Earth Worth
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Home > 
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Earth Worth > 
Item#: 9SIA1B00B55728
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