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CoolStar 400W MH Grow Light Ballast






Quiet, efficient, and high-performance, the CoolStar MH 400w Ballast is a powerhouse system. Designed by growers; made for growers, this grow light ballast is manufactured by High Yield Lighting, a leading innovator in horticultural lighting production. What makes CoolStar stand out from other ballasts on the market is its unique thermal chimney design. This protects vital components from overheating, extending the performance and life of your ballast by a wide margin. Constructed with premium UL-Listed components from Sunmaster.

  • Runs 400-watt Metal Halide (MH) grow lights.
  • Multi-volt 120v/240v power inputs
  • Includes 10′ 120v power cord
  • Dimensions: 6.5″ H x 9.5″ W x 11.5″ L

In stock

SKU: BAL-CS-0400MH Categories: , , Tag:
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HTG Supply is committed to providing you with the very best products, pricing and service in the industry. We will ship your order fast and discreetly packaged to protect your privacy. Buy with confidence knowing your HTG Supply purchase includes simple returns as well as lifetime product support. Call our team of real growing experts with your purchasing or product use questions, and we will be here to help!

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CoolStar 400W Metal Halide Grow Light Ballast

A workhorse of a ballast, the Coolstar 400w MH is a high-performance ballast system. What the CoolStar lacks in fancy features it makes up for in its quality construction and reliable operation. Made with premium UL-Listed components tailored for horticultural production. CoolStar ballasts are designed with a unique thermal chimney design instead of your typical single-box design. This helps run the grow light ballast at a cooler temperature, protecting components from overheating, improving performance, and extending service life. The durable steel enclosure further protects the grow-light ballast, its ventless design ensures no dust, dirt, or moisture enters the system. Package comes with 400-watt MH ballast and 10′ 120v power cord.


  • INNOVATIVE THERMAL CHIMNEY: Reduces component temperatures, improves performance, extends service life
  • VENTLESS: Protects against dirt, dust, and moisture.
  • SUNMASTER INSIDE: Premium components specifically tailored for horticultural production
  • RUBBER FEET: Provides electrical protection, noise reduction, and airflow
  • INTERNAL RUBBER INSULATORS: Assures quiet operation
  • KEY HOLE BRACKETS: Can be wall-mounted
  • HIGH YIELD LIGHTING RECEPTACLE: Fits High Yield Lighting Socket Cord Sets
  • RETRACTABLE HANDLE: Saves space & allows for a low profile

Technical Specifications:

  • Runs 400-watt Metal Halide (MH) grow lights.
  • UL-Listed built with durable steel construction
  • Includes 10′ 120v power cord
  • Dimensions: 6.5″ H x 9.5″ W x 11.5″ L
  • Multi-volt 120v/240v power inputs
  • USA-Assembled
Weight 38.2 lbs
Dimensions 10.5 × 9 × 15.5 in


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