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Sylvania Grolux 400 Watt
The Sylvania Grolux 400 Watt HPS delivers a powerful 58,000 lumens of dual-spectrum light, positioning it as the go-to lamp for growers who need substantial light output without the thermal demands of a 600W setup. Sylvania's patented ARC tube technology ensures maximum PAR efficiency with an enhanced blue spectral component for full-cycle cultivation without lamp changes. The 400W Grolux effectively covers a grow area of approximately 100×100 cm and is compatible with both magnetic and digital E40 ballasts, including dimmable units. An excellent balance of performance, energy consumption and thermal management for serious indoor growers. Available now at Plant and Flower with fast delivery across Belgium.
Sylvania Grolux 400W HPS – Balanced Performance for Mid-Range Indoor Cultivation
The 400W Grolux occupies the sweet spot in Sylvania's horticultural HPS lineup. For growers operating 400W HPS systems, this lamp delivers the output needed for productive grows while keeping energy consumption and heat generation at manageable levels. It is one of the most widely deployed HPS lamps across European indoor gardens.
Light Output and Spectral Characteristics
The Grolux 400W produces 58,000 lumens at a colour temperature of 2050K. The spectral distribution is dominated by red-orange wavelengths critical for flowering, supplemented by an enhanced blue component that exceeds standard HPS output in the 400-500nm range. This spectral profile enables growers to run the same lamp through both vegetative and flowering phases, reducing equipment costs and simplifying light management.
Energy Efficiency vs. Output Trade-off
The 400W power draw represents a practical midpoint between the compact 250W and the high-output 600W. Growers working with a footprint of approximately 100×100 cm will find the 400W delivers sufficient photon density for vigorous growth and dense flower development. The reduced heat load compared to a 600W lamp makes climate control more straightforward, particularly in smaller or poorly ventilated grow rooms.
Why Growers Choose the Grolux 400W
Sylvania's patented ARC tube design is the key differentiator. This technology delivers up to 10% more photosynthetically active radiation than comparable standard sodium lamps at the same wattage. The result is measurably better light quality reaching the plant canopy, which translates directly into healthier vegetative growth and improved flower density.
- 58,000 lumens output: delivers high photon density across a 1 m² grow area for productive cultivation.
- Dual-spectrum design: enhanced blue output allows single-lamp operation through the complete growth cycle.
- Universal E40 fitting: compatible with all 400W ballasts including dimmable digital units.
Get the Sylvania Grolux 400W from Plant & Flower with fast shipping throughout Belgium. Complete your setup with a 400W ballast and a reflector for optimal light distribution.
Can the Sylvania Grolux 400W be used with a dimmable digital ballast?
The Sylvania Grolux 400W is fully compatible with both magnetic and digital 400W ballasts, including dimmable units. When used with a digital ballast, the lamp typically delivers more stable lumen output and maintains consistent colour rendering across dimming levels. Always ensure the ballast wattage matches the lamp rating exactly.
