Sylvania Grolux 400W Growth and Flowering Bulb

Professional Dual-Spectrum HPS for Complete Growth Cycles

The Sylvania Grolux 400W stands as one of the most versatile high-pressure sodium bulbs available for indoor horticulture. This exceptional HPS lamp features a carefully engineered dual-spectrum output that supports both vegetative growth and flowering phases, making it an ideal choice for growers seeking a single lighting solution throughout their plants' entire lifecycle. With its enhanced blue spectrum content integrated into the traditional HPS output, this bulb delivers the comprehensive light your plants need from seedling to harvest.

Superior Performance Features & Benefits

What sets the Sylvania Grolux 400W apart from standard sodium bulbs is its remarkable combination of power, efficiency, and spectral balance. This lamp produces an impressive 58000 lumens - representing the highest light output available in the 400W category, ensuring your plants receive maximum photosynthetic energy for robust development.

• Exceptional 58000 lm output - industry-leading performance for 400W HPS bulbs
• Dual-spectrum technology combining HPS efficiency with blue spectrum enhancement
• 2050K color temperature optimized for both vegetative and flowering stages
• Enhanced blue spectrum prevents excessive stretching during vegetative growth
• Proven sodium technology for reliable, consistent performance
• Compatible with standard 400W HPS ballasts and reflector systems
• Extended operational lifespan with maintained spectral output

Application Guide & Growing Benefits

The Sylvania Grolux 400W excels in medium-sized growing operations where growers need reliable, full-spectrum lighting without the complexity of switching bulbs between growth phases. This makes it particularly valuable for perpetual harvest setups, small commercial operations, and dedicated hobbyists who want professional results with simplified equipment management.

During vegetative growth, the enhanced blue spectrum component helps maintain compact, healthy plant structure while promoting strong stem development and lush foliage. As plants transition to flowering, the dominant red/orange spectrum drives flower initiation and development, while the blue component continues supporting essential metabolic processes. This seamless spectrum transition eliminates the shock often associated with bulb changes and maintains consistent environmental conditions throughout the grow cycle.

The lamp's high 58000 lm output makes it suitable for coverage areas of 3x3 to 4x4 feet, depending on reflector choice and mounting height. For optimal results, pair with quality ventilation systems as with all HPS lighting, and consider the enhanced heat output when planning your environmental controls.

Ideal for Dedicated Indoor Growers

This dual-spectrum HPS bulb is perfect for intermediate to advanced growers who understand the value of consistent, high-quality lighting but prefer the simplicity of a single-bulb solution. It's particularly well-suited for growers cultivating flowering plants that benefit from both strong vegetative development and robust flower production. The Sylvania Grolux 400W is also an excellent choice for those running continuous harvest operations where different plants may be at various growth stages simultaneously.

Consider pairing this bulb with our Diamond Reflective Foil to maximize light distribution and efficiency, and complement your feeding program with quality nutrients like Advanced Nutrients Sensi Terra for optimal plant development.

Technical Specifications

For comprehensive growing guidance, explore our Hydroponics for Beginners guide and learn about NPK Fertilizer Fundamentals to maximize your growing success with this professional-grade lighting solution.