Growking’s Rail Full Spectrum 40 Watt is the smallest bar in the Rail series, built for compact propagation areas and targeted supplementation. The 24 x 9 x 4.5 cm, 0.7 kg fixture uses 22 Osram Oslon SSL LEDs and passive cooling in an IP65-rated housing. It draws up to 40 W and delivers a measured photon flux of 74.1 µmol/s (≈1.86 µmol/J), with a 90° beam and an optimal coverage around 16.5 x 16.5 cm (≈0.165 m²). The spectrum emphasizes red with peaks at 640 and 665 nm alongside a blue peak near 445 nm for balanced vegetative growth and flowering support. Typical service life is rated at 70,000 hours. Includes hanging eyelet and external driver with EU plug.
