400W HPS lamps: Reliable lighting for growth, flowering and cuttings
400W HPS lamps have been a favourite among cannabis growers for many years. These high-pressure sodium lamps (High Pressure Sodium) combine powerful light output with a broad spectrum suitable for both the growth phase, the flowering phase and the maintaining mother plants for cuttings. Perfect for 80×80 to 100×100 cm grow tents, they are an ideal middle ground between 250W and 600W systems.
Why choose a 400W HPS lamp?
✔ Suitable for growth and flowering of cannabis plants
✔ Ideal for maintaining mother plants for cuttings
✔ Powerful light output (approx. 55,000 lumens) with high penetration
✔ Affordable alternative to LED grow lights or 600W HPS in medium-sized rooms
Thanks to the warm, red-orange light spectrum with sufficient intensity, 400W HPS lamps can support the entire growing process. Combined with the right distance from the plant and good extraction, this is a very reliable growing solution.
Applications of 400W HPS lamps
Growth
Although HPS lamps naturally provide a warmer light, they provide sufficient intensity for a healthy vegetative phase. For extra blue stimulation, a broad spectrum (dual spectrum) HPS lamp can be chosen.
Bloom
The flowering phase is where the 400W HPS really excels. The red spectrum encourages flower formation, compact buds and rich resin production.
Mother plants and cuttings
Thanks to their stable light output, these lamps are ideal for maintaining mother plants. The plants remain healthy and sturdy, ideal for regular new cuttings take.
Complete 400W HPS sets at GrowDeal.nl
Want to get started right away? Then choose a complete set with:
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400W HPS lamp (growth/flowering or dual spectrum)
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Reflector (wing model or cooling hood)
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Ballast (VSA)
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Power cord and connection material
A total solution suitable for novice and experienced growers.
Technical specifications (average)
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Power: 400 watts
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Light output: ± 55,000 lumens
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Spectrum: red-orange (± 2000K) - suitable for growth & flowering
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Lifetime: approx. 10,000 burning hours
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Ideal surface: 80x80 to 100x100 cm
Frequently asked questions about 400W HPS lamps
Can I use a 400W HPS lamp for both growth and flowering?
✅ Yes, especially when combined with a dual spectrum lamp, it is suitable for both phases.
Is 400W sufficient for mother plants?
✅ Absolutely. Many growers use 400W HPS lighting to keep mother plants healthy and productive for taking cuttings.
How much heat does a 400W HPS lamp produce?
➡ Slightly less than a 600W HPS, but good extraction is still needed. A fan controller helps with temperature control.
Want to know more about HPS lighting?
Read our blog for tips on choosing the right grow light, or check out the frequently asked questions for more info on usage, maintenance and lighting planning.
Why buy 400W HPS lamps from GrowDeal.nl?
✔ Free shipping from €50
✔ Available directly from stock
✔ Individual lamps and complete sets
✔ Expert advice for every stage of cultivation
Order your 400W HPS lamp and give your plants everything they need for strong growth, rich flowering and powerful cuttings!