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Ballast

Grow light ballasts from 250W to 600W

A ballast converts mains power into the precise current your HPS or MH bulb needs to ignite and run safely. Without the right match in wattage, you risk flickering, reduced output or lamp failure. This category includes magnetic models like the affordable Optilight range and advanced electronic ballasts from Lumatek with soft-start ignition, dimming capability and built-in surge protection.

Superplant digital ballasts offer a solid middle ground between price and performance. Available in 250W, 400W and 600W to cover every grow tent size. Find the right ballast for your indoor lighting setup with fast delivery across Belgium.

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Superplant Ballast 250W magnetic long life unit product photo | Ballast

Superplant Ballast 250 Watt

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Superplant Ballast 400W magnetic HPS MH long life product | Ballast

Superplant Ballast 400 Watt

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Superplant Ballast 600W magnetic reliable HPS MH long life | Ballast

Superplant Ballast 600 Watt

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Ballast Optilight 400W plug and play splash proof HPS MH | Ballast

Ballast 400 Watt Optilight

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Horti Gear PRO Ballast 600W HPS MH grow lamp power unit | Ballast

Ballast Horti Gear PRO 600 Watt

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Lumatek Digital Ballast 250W dimmable superlumens HPS MH unit | Ballast

Lumatek Digital Ballast 250 Watt Dimbaar+Superlumens

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Lumatek Digital Ballast 600W dimmable superlumens HPS MH unit | Ballast

Lumatek Digital Ballast 600 Watt Dimmable+Superlumens

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Our ballast range for HPS and MH

Every HPS or MH grow bulb needs a ballast to ignite and run safely. This device — also known as a VSA or control gear — converts mains voltage into the precise current required by high-intensity discharge lamps. At Plant & Flower, your Belgian grow shop since 2011, we stock ballasts from 250W to 600W from Lumatek, Optilight and Superplant for your indoor lighting setup.

Magnetic or electronic: understanding the difference

A ballast does far more than simply switch a lamp on. It regulates the electrical current flowing through the discharge tube, preventing dangerous spikes at startup and maintaining steady output throughout the entire light cycle. Two technologies coexist: magnetic (older coil-based, robust, affordable) and electronic (digital circuit board, lighter, quieter, often dimmable). The choice depends on your budget and how much you care about heat output and operational noise.

Technical specifications that matter

Magnetic ballast: iron core + copper coils, reliable and durable, but 3-4 kg heavier, more heat, may develop a hum after years
Electronic ballast: digital circuit board, 30-40 % less heat, silent operation, dimmable, longer bulb lifespan
Standard wattages: 250W (tent 60×60 to 80×80 cm), 400W (100×100 to 120×120 cm), 600W (120×120 cm and larger)
HPS/MH compatibility: all ballasts accept both lamp types at matching wattage
Super Lumens function: temporary +10 % power boost, ideal in late flowering (Lumatek and Superplant models)
Maximum cable length: 10 m for magnetic, 15 m for electronic, to prevent voltage drop

Popular models by brand and wattage

The Lumatek Digital series is the European reference for electronic ballasts. Available as Lumatek Digital 250W for small tents, Lumatek Digital 400W for medium setups, and Lumatek Digital 600W for larger installations. Each model features a dimmable mode (50, 75, 100 %) and Super Lumens boost.

For growers who prefer the traditional magnetic reliability, the Optilight 400W offers proven dependability at an accessible price. The Superplant range combines digital technology with competitive pricing: the Superplant 400W and Superplant 600W are dimmable and feature built-in protection against short circuits and overheating.

Installation and safety

Always position the ballast outside the grow tent on a dry, heat-resistant surface with adequate airflow. Never hang it from the tent poles and keep all ventilation openings clear. Cable runs between ballast and reflector should stay below 10 m for magnetic units and 15 m for electronic ones to avoid voltage drop. Before powering on, always verify that the lamp wattage matches the ballast rating exactly. For dimmable models, set the output dial to the correct wattage before connecting to the mains. Want a plug-and-play solution? Browse our complete lighting kits that bundle ballast, bulb and reflector in one package.

FAQ - Frequently asked questions about ballasts

Can I use the same ballast for HPS and MH bulbs?

Yes. Every ballast in our range supports both HPS and MH lamps. Simply swap the bulb when transitioning from vegetative growth to flowering, as long as the wattage remains the same as the ballast rating.

Is a digital ballast worth the extra cost?

In most cases, yes. Electronic ballasts convert more electricity into light rather than heat, which lowers your energy bill and extends bulb life. The initial price difference is typically recovered within 2-3 growing cycles through reduced running costs.

What wattage ballast for a 120×120 cm tent?

A 600W ballast provides the intensity required to cover a 120×120 cm area evenly. Pair it with a matching 600W HPS or MH bulb and a quality reflector for the best results during both vegetative and flowering stages.

What does the Super Lumens setting do?

Super Lumens temporarily increases lamp output by roughly 10 % above its rated wattage. Useful during the last weeks of bloom to push yields higher. Avoid running it continuously — it will shorten bulb life over time.

Should the ballast be placed inside or outside the tent?

Always outside. Ballasts generate heat during operation, which raises the temperature inside the tent and makes climate control harder. Place the unit on a dry, heat-proof surface with good airflow to ensure adequate cooling.

How long can the cable be between ballast and reflector?

Keep it under 10 m for magnetic ballasts and under 15 m for electronic models. Longer cables cause voltage drop, which reduces light output and can shorten bulb lifespan. Use the shortest practical cable length for the best performance.

Browse our complete range of ballasts at Plant & Flower, with fast delivery throughout Belgium. Our team gladly advises on choosing between magnetic and electronic based on your budget and grow setup.