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Phantom Dial-A-Watt 400/250W, 120/240V

Item #: PHB2040

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Phantom Dial-A-Watt 400/250W, 120/240V

Additional Images

Reflector Plug Type

This universal grow light ballast connects to any grow light reflector. It features a universal lamp cord receptacle allowing the use of either the 'standard' or the 'Hydrofarm' plug type. Learn more about reflector cord types


Ballast Type
Watt Output
Power Input
Cord Included

8ft 120V

3 Year

The Phantom PHB2040 Digital Ballast was developed from our popular Phantom II ballast line. It retains all of the reliability and engineering superiority of the Phantom II models and adds 250W/400W switching capability as well as three-way output control, making it highly versatile. Output wattage is selected using a recessed switch on the rear panel.

Like the Phantom II ballasts, the PHB2040 is totally silent, energy efficient, reliable, and lightweight. Its industry-leading Smart Alert Technology utilizes a 32 MHz fully integrated microprocessor to keep your setup running smoothly.

The Phantom PHB2040 has built-in hot re-strike programming to protect the lamp and ballast in the event of a temporary loss of power. The ballast will not attempt to restart a hot lamp for at least 15 minutes. 

  • Smart Alert Technology
  • High-precision microprocessor control
  • High efficiency
  • Totally silent operation
  • Versatile 250W/400W output
  • Multi-input voltage (120‒240V)
  • Ignition voltage control
  • Three-way dimming feature:  Dim (85%), Standard (100%), and Boost (110%)
  • Intelligent lamp ignition and power control
  • LED indicators
  • Intelligent lamp detection
  • End-of-life lamp protection and indication
  • Current sense intelligent startup
  • Precision thermal controls alert the user to high heat and overheat conditions
  • Dual lamp receptacle—works with all common reflectors
  • Internal RF shielding
  • Generator ready
  • FCC-compliant


Ballast Type Digital Ballast
Double Ended Optimized No
Dimmable Yes
Watts 400W
Cord Length 8 ft.
Voltage 120‒240V
Brand Phantom
Weight (lb.) 6.1
Length (in.) 11.6
Width (in.) 9
Height (in.) 3.4
Warranty 3 Year
Free Shipping Yes
CSA Listed Yes

Shipping Info:

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Ships Via FedEx/UPS

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