The ThinkGrow Model One 5' LED Light Bar (TLB-2) is a modular 90 W bar for the Model One system, providing four independently controllable spectrum channels (white, deep red, far red, UV) when paired with a TLD-4 driver and a TrolMaster controller. The bar delivers over 252 µmol/s PPF and carries an IP56 ingress rating with an L90 lifetime greater than 54,000 hours. Its compact 57.36 x 2.68 x 2.20 inch housing weighs about 1.17 kg. Recommended mounting height is over 6 inches above the canopy. Retail listings indicate a typical single‑bar coverage of about 0.9 m²; multiple bars can be combined to scale coverage and uniformity. The 5‑foot length extends reach versus the 4‑foot TLB‑1 while maintaining the same 90 W per bar.