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Lighting Set 400 Watt

400 Watt lighting kit: the practical step up from 250W

Outgrowing a 250W setup? A 400 Watt lighting kit nearly doubles your light output while keeping heat and electricity consumption well within reach of a standard extraction system. This wattage covers grow tents from 100×100 cm to 120×120 cm and strikes an ideal balance between intensity and climate control.

The Lumatek kit features a dimmable electronic ballast adjustable from 250 to 400W, optionally paired with an Adjust-A-Wing Avenger reflector. Superplant kits combine a solid ballast with proven bulbs — Sylvania Grolux for veg, Philips GreenPower for dual-spectrum versatility. Fast delivery across Belgium.

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Kit 400W Superplant Sylvania Grolux full spectrum grow bloom | Lighting Set

Complete Light Superplant 400 Watt Sylvania Grolux

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Kit 400W Superplant Philips Greenpower HPS powerful bloom | Lighting Set

Complete light 400 Watt Superplant Philips Greenpower

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Our 400 Watt lighting kit range

The 400 Watt lighting kit sits right in the middle of the power spectrum — strong enough for serious results, efficient enough to keep running costs in check. Each set pairs a matched ballast, HPS lamp and reflector, calibrated for grow tents from 100×100 cm to 120×120 cm. Plant & Flower stocks two configurations to cover different budgets and spectrum priorities — from the precision dimmable Lumatek to the value-focused Superplant kits.

400 Watt lighting kit: the mid-range workhorse for indoor growers

Where 250 Watts suits a small tent and 600 Watts targets maximum yield, 400 Watts hits a practical sweet spot. It covers a growing area of roughly 100×100 cm to 120×120 cm with ample intensity for both vegetative growth and flowering. The heat output stays manageable with a basic extraction setup, and electricity consumption remains moderate compared to a 600W rig. For Belgian growers stepping up from their first kit, this wattage offers measurable yield improvement without requiring major climate-control upgrades.

Every kit ships with three components calibrated to work together. The ballast delivers stable voltage to the bulb. The HPS bulb provides the orange-red spectrum for flowering — or a dual spectrum in the case of the Philips GreenPower. The reflector redistributes light onto the canopy, minimising losses against tent walls.

Two 400W configurations compared

Superplant + Sylvania Grolux — MH bulb with blue-enriched spectrum, optimised for vegetative growth
Superplant + Philips GreenPower — HPS dual-spectrum 58,000 lm, 30 % extra blue, the professional reference bulb

The Philips GreenPower advantage: dual spectrum

The Philips Master GreenPower 400W stands out in this category. Where a classic HPS lamp delivers primarily red-orange light, the GreenPower adds 30 % extra blue to its spectral curve. In practice, that means a single bulb can carry your plants from vegetative growth all the way through flowering with solid results in both phases. Philips' PIA technology and ZrCo getter ensure stable lumen output over the full lamp life — one reason this bulb has become a reference in commercial horticulture greenhouses across Europe.

For growers who prefer to optimise each phase with a dedicated bulb, our 400W HPS/MH bulb section offers pure MH alternatives (for veg) and classic HPS (for bloom). The ballast in both Lumatek and Superplant kits accepts either technology without modification — so upgrading or switching bulbs mid-cycle is straightforward.

Installation, ventilation and scaling up

Installation follows the same principle as a 250W kit: ballast outside the tent on a dry surface, reflector centred roughly 35-40 cm above the canopy during flowering, bulb connected via the supplied cable. A 400W generates more heat than a 250W, so a properly sized extractor fan (minimum 150 to 220 m³/h for a 1 m² tent) is essential to keep temperatures between 22 and 28 °C. Replace the bulb every 12 to 18 months to maintain peak output. Consider a 600 Watt kit when your tent reaches 140×140 cm or larger.

FAQ - Frequently asked questions about the 400 Watt kit

What area does a 400 Watt kit cover?

A 400W kit effectively covers a grow tent from 100×100 cm to 120×120 cm. For smaller tents (80×80 cm or less), a 250W kit is sufficient; for larger spaces of 140×140 cm or more, move up to a 600W kit to maintain uniform intensity across the full canopy.

What is the difference between Sylvania Grolux and Philips GreenPower?

The Sylvania Grolux is an MH bulb with a blue-enriched spectrum, optimised for vegetative growth. The Philips GreenPower is a dual-spectrum HPS: predominantly red-orange for flowering, but with 30 % extra blue making it effective during veg as well. If you prefer a single bulb for the entire cycle, choose the GreenPower.

Is the Lumatek 400W ballast genuinely dimmable?

Yes. The Lumatek 400W digital ballast supports 250W and 400W settings plus the Super Lumens function that boosts output by 10 % — useful during late flowering. This flexibility lets you limit intensity for clones or young plants and gradually step up to full power as the canopy fills in.

Do I need to switch reflectors if I enlarge my tent?

The standard hammered reflector is optimised for symmetrical coverage on a square footprint. If you move from 100×100 cm to 120×120 cm, the Adjust-A-Wing Avenger reflector provides a noticeably broader light footprint thanks to its adjustable wings — preventing dark corners in the tent edges.

Order your 400 Watt lighting kit from Plant & Flower today and get fast, discreet delivery anywhere in Belgium.