It is important to have the best 400 watt mh ballast. We are here to help you pick the right one for your needs from all the best available products in market today.

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Our Top Picks:

Best Overall: Buy: Sun System 400 Watt Mh Ballast READ REVIEW

Best For The Price: Buy: Vivosun 400 Watt Mh Ballast READ REVIEW

Best For Delivery Time: Buy: Hydrofarm 400 Watt Mh Ballast READ REVIEW

Best For Compact Fluorescent: Buy: Sunlite 400 Watt Mh Ballast READ REVIEW

Best For Great Price: Buy: Sunlite 400 Watt Mh Ballast READ REVIEW

Best With Lamp Type: Buy: Acuity Lithonia 400 Watt Mh Ballast READ REVIEW

Best For Metal Halide Lamp: Buy: Nsi Industries 400 Watt Mh Ballast READ REVIEW

Best Overall: Sun System 400 Watt Mh Ballast

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Sun System makes beautiful and good-quality ballast with classic and higher-grade materials. The Sun System 400 Watt Mh Ballast comes with a high temp of 150 degrees c. Wire connections will provide years of trouble-free operation. Make sure this fits by entering your model number. Also, it is compact and runs cool.

Most importantly, the sun system 400 watt mh ballast works fine, It fits perfectly and has a compact design.

Most customers found that the ballast does not have, nor does it need, a glass cover-those are only to be used with a mhlight. Moreover, they also found that the ballast takes both metal halide and hps at those watts. Further, they say that this unit has that ballast built-into the fixture. To sum up, many buyers have used the sun system 400 watt mh ballast for more than a few months without any complaints, and it shows no sign of giving up.

• This is the best bang for your buck.
• This is great for veg, not so great for flowers.
• This does admirably for both vegetation and especially flowering stages.
• This features a high quality and reliable capacitor using German film.

Best For The Price: Vivosun 400 Watt Mh Ballast

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For a low asking price, Vivosun 400 Watt Mh Ballast has managed to overwhelm their customers by packing as many features as they could. The vivosun 400 watt mh ballast has overheating protection and it is super quiet. The manufacturer says: Our mission is to empower growers at all levels and of all types to grow the best of what they love. Moreover, it works well and it is great for power cord.

The ballast is normal and it works great. Above all, the vivosun 400 wattmh ballast is the global leader for at-home growing technology & equipment.

Most customers found that the ballast works for growing in dirt too. Further, they say that the ballast is great little ballast for the money. Moreover, a few strongly agree that this replaced a virtual sun ballast that lasted 6 years, has restart protection built in. To sum up, buyers found this to be one of the best ballast for daily purposes.

• This is very far away from Texas.
• Notice: set ballast to the same watt option as the matched bulb before starting.
• Watt option: 150w / 250w / 400w / super lumens (110%).
• This does not interfere with any electrical appliances.

Best For Delivery Time: Hydrofarm 400 Watt Mh Ballast

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If you often find yourself scrambling for convenient and suitable ballast, Hydrofarm 400 Watt Mh Ballast is your end point. The hydrofarm 400 watt mh ballast features a resin cased circuit board with a sealed bearing fan so it will run cooler than any other ballast and it’s been tested to withstand the extreme atmospheric conditions of virtually any growing environment. Uantum 400w dimmable ballastthe quantum dimmable ballast brings quality, efficiency, and high intensity illumination to your garden. The quantum dimmable ballast is silent, generator - ready, efficient, and cool - running — this is one cool ballast.

The ballast works perfectly and it works as advertised. Above all, the hydrofarm 400watt mhballast is safe and it can wait for a great deal.

Most customers agree that the ballast will turn it on, but you would want to run your 600w bulb for about 100 hours before dimming it, or you risk significantly decreasing the lifespan of the bulb. Also, a few also found that ballast is becoming a more common feature nowadays. And, they say that the ballast has no problem with black-outs and brown-outs.

• This is a great price on a quality ballast.
• The cooling fans that are supposed to keep the ballast cool, are junk.
• This is designed to operate single-ended lamps only, and cannot run double-ended (de) lamps.
• This is made in China, and imported from Canada.

Best For Compact Fluorescent: Sunlite 400 Watt Mh Ballast

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The Sunlite 400 Watt Mh Ballast's material feels more premium than its price would suggest. Moreover, the sunlite product line includes compact fluorescent, linear fluorescent, incandescent, hid, metal halide, halogen, decorative, miniature, specialty, stage - studio lamps and led lamps. Make sure this fits by entering your model number. Above all, the sunlite 400 wattmh ballast includes a full array of indoor and outdoor household fixtures, commercial fixtures and electrical products including extension cords, socket adapters, wall plates, receptacles and switches, dimmers and timers, surge protectors and much more.

To sum up, the tone of buyers is very positive and we believe that the ballast suits the purpose.

• Use with a 1 - 400 watt m135 or m155 mh lamp.
• Ground ballast core and capacitor case.
• Good brand reputation.

Best For Great Price: Sunlite 400 Watt Mh Ballast

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The Sunlite 400 Watt Mh Ballast is capable of outshining several other ballasts featured in this list in overall features for the price point. Also, the sunlite product line includes compact fluorescent, linear fluorescent, incandescent, hid, metal halide, halogen, decorative, miniature, specialty, stage - studio lamps and led lamps. Make sure this fits by entering your model number. Most importantly, the sunlite 400watt mh ballast includes a full array of indoor and outdoor household fixtures, commercial fixtures and electrical products including extension cords, socket adapters, wall plates, receptacles and switches, dimmers and timers, surge protectors and much more.

In short, the tone of buyers is very positive and we believe that the ballast suits the purpose.

• Ground ballast core and capacitor case.
• Use with a 1 - 400 watt m59 mh lamp.
• Good investment for the long term.

Best With Lamp Type: Acuity Lithonia 400 Watt Mh Ballast

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The Acuity Lithonia 400 Watt Mh Ballast gives the top-tier ballast a run for their money by offering flagship specs at a much more affordable price. In addition, it is with ambient temp and it works with lamp type. Make sure this fits by entering your model number. Most importantly, the acuity lithonia 400 watt mhballast features protected pulse start, standards ul listed, nom certified.

• Package dimension: 18"l x 18"w x 21"h.
• Delivers what they promise.

Best For Metal Halide Lamp: Nsi Industries 400 Watt Mh Ballast

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The Nsi Industries 400 Watt Mh Ballast is suitable and reliable and fits well with your daily purpose. Make sure this fits by entering your model number. And, the ballast includes ballast, cap, ignitor, brackets & lamp. When it comes to finding a reliable ballast, the nsi industries 400 watt mh ballast is definitely your first choice.

• 400 watt metal halide lamp included.
• One of the newcomers and featured product.