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Lumatek MH 400 Watt
The Lumatek MH 400 Watt delivers 40,000 lumens of blue-white growth light at 4200 Kelvin with a PPF of 518 µmol/s and the highest efficiency in the Lumatek MH range at 100 lm/W. This pulse-start metal halide lamp with high-temperature quartz arc tube is purpose-designed for the vegetative phase, promoting compact growth with robust stems and shortened internodes. The CRI of 65 enables precise visual diagnostics of plant health and nutrient status under this light source. With a 10,000-hour rated life and standard E40 base, it integrates into any 400W lighting setup. Available at Plant and Flower with fast Belgian delivery.
Lumatek MH 400W – Peak Efficiency Metal Halide for Mid-Range Vegetative Cultivation
The Lumatek MH 400W stands out as the most efficient lamp in the Lumatek MH lineup, delivering the highest lumens-per-watt ratio across all wattages. For growers running 400W lighting systems who want to maximise vegetative quality before switching to HPS for flowering, this lamp provides a technically superior blue-spectrum solution.
100 lm/W: Best-in-Class MH Efficiency
At 40,000 lumens and 100 lm/W, the Lumatek MH 400W achieves the highest efficiency of any lamp in the Lumatek MH range. The PPF of 518 µmol/s quantifies the photosynthetically active photon output, confirming that a substantial proportion of the total light output falls within the wavelengths plants use for growth. The 4200K colour temperature places the spectral peak in the blue range, directly targeting the photoreceptors that regulate vegetative development.
Measurable Impact on Plant Architecture
Growing under MH lighting during the vegetative phase produces documented effects on plant morphology. The blue-dominant spectrum suppresses auxin-mediated stem elongation, resulting in plants with shorter internodes, thicker stems and a more compact overall structure. This architecture maximises light penetration into the canopy during subsequent flowering, directly supporting higher yields.
- 518 µmol/s PPF at 100 lm/W: the most efficient photon delivery in the Lumatek MH range for cost-effective vegetative growth.
- CRI 65: significantly higher colour rendering than HPS lamps, enabling early detection of nutrient deficiencies and health issues.
- E40 base: universal compatibility with 400W ballasts, optimal performance with Lumatek electronic units at exact wattage.
Critical Usage Note
MH lamps must never be dimmed or boosted. The Super Lumen function on Lumatek ballasts is for HPS lamps only. Always run the MH 400W at its rated 400W setting to protect lamp life and maintain optimal spectral output.
Get the Lumatek MH 400W from Plant & Flower with fast shipping throughout Belgium. Pair with a Lumatek 400W digital ballast for veg, then switch to a Lumatek HPS 400W for flowering.
Can I use the Super Lumen boost on my Lumatek ballast with the MH 400W?
No. Lumatek explicitly recommends against dimming or boosting MH lamps. The Super Lumen function is designed exclusively for HPS lamps. The Lumatek MH 400W should always operate at its rated 400W to preserve lamp life and ensure optimal spectral output for vegetative growth.
