400W Knob Dimming CMH Ballast

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CMH-315W/K Knob Dimming Digital Ballast



400W knob dimming CMH low frequency square wave digital ballast utilizes Fuzzy Logic 4th Generation ballast technology. The patent technology can keep lumen maintenance rate higher than 95% at 30,000 hours and maintain the initial spectrum. It can ignite lamps more than 100 feet away. With LamPal® technology, this ballast can work with 150W, 210W, 315W, 350W, and 400W CMH/HPS/MH lamps. You can use the knob to turn on/off the light and to output 150W, 210W, 315W, 350W and 400W.

When lamp power is decreased, it saves energy and shifts light spectrum to more blue light for veggies; when lamp power is increased, it outputs more strong light and shifts light spectrum to more red light to grow more and bigger flowers and shorten the growing circle.

Characteristics of CMH-315W/K Knob Dimming Ballast

Input power 442W
Output power (Max)400W
Operating voltage120V/208V/240V/277V
Amperage drawn3.68A/120V, 2.13A/208V, 1.84A/240V, 1.60A/277V
Safe voltage94V~276V
Input frequency50/60Hz
Power factor>0.99
Communication interfaceKnob dimming
Lamp wire length (Max)>100 feet (16 gauge lamp wire)
Power/light output0W (OFF), 150W, 210W, 315W, 350W, and 400W (SunPlix)
Protection functionsProtection of short-circuit, open-circuit, over-voltage, under-voltage, over-current, hot lamp startup, lightning, over heat, and lamp failure with lamp life warning.
Size L: 10”, W: 5.1”, H: 4”
Net weight5.4 lbs
Warranty3 years
CertificatesUL, CUL, FCC

Black wire: AC power Line wire
White wire: AC power Neutral wire
Green wire: Ground wire

Black wire: AC power Line wire
White wire: AC power Neutral wire
Green wire: Ground wire

Compatible Lamps:


  •  CMH-315W digital ballast should work on operating voltage with corresponding bulbs. High power bulb can be used to dim to low power output, but not the reverse.
  • The work environment temperature for the ballast ranges from -40 F°/-40 C° to +122 F°/+50 C°, the maximum work temperature of its shell can be +158 F°/+70 C°.
  • The ballast should avoid working under high temperature environment which will affect its service life.
  • Combustible substances and corrosive gas should not be placed in the work environment of the ballast.
  • If a ballast is damaged, do not try to fix it. Users should exchange it with suppliers or send it to the factory for maintenance.315W T9 315W T12


SunPlix CMH ballast is the real low frequency, square wave CMH ballast!

Other brand CMH ballast is NOT the real low frequency, square wave CMH ballast

Additional information

Weight 7 lbs
Dimensions 12 × 9 × 6 in
Power Cord Type

120V 8', 240V 8'


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