The Grower’s Choice 4K 400W SE CMH lamp is engineered to deliver a powerful and balanced full-spectrum light output, ideal for all stages of plant growth with a particular emphasis on strong vegetative development. Emitting a color temperature of 4200K, this single-ended ceramic metal halide bulb mimics natural sunlight with high spectral fidelity, providing plants with a well-rounded blend of blue, red, and supplemental UV wavelengths. Its high CRI of approximately 98 allows for accurate visual inspection of crops while enhancing photosynthetic activity and overall plant health. Designed for use in 400W CMH fixtures, this lamp produces a strong PAR output that penetrates deep into the canopy, supporting even and vigorous growth. But if this lighting system is too powerful for your grow space, then take a look at the ROI-E420 system, or the smaller 10K 1000W SE for better light management.
