SunBlaster T5 HO 6400K Replacement Bulb - 4ft

Full‑Spectrum 4 ft T5HO Lamp for Vigorous Vegetative Growth & Seedling Starts

The SunBlaster T5HO 4 ft 6400 K Replacement Bulb delivers a balanced, full‑spectrum light optimized for propagation, vegetative growth, leafy greens and herb cultivation. Drawing 54 W, this lamp produces strong light intensity while staying cool - perfect for tight spaces, propagation racks, or multi‑tier setups.

With a colour temperature of 6400 K, this tube emits a spectrum tuned to support photosynthesis, especially during early growth stages and leafy green production. Because of its low heat output, fixtures can be placed ~6-8 inches above plants for maximum light exposure and minimal risk of heat stress.

Rated for ~10,000 hours of use, this lamp is designed for reliability and longevity. Whether you're sprouting seeds, rooting cuttings, growing large vegetative plants or running greens year‑round, this replacement lamp helps ensure consistent light output and strong plant development.