The ThinkGrow Model One 4' LED Light Bar (TLB-1) is a 90 W modular horticulture bar that provides four independently controllable spectrum channels: white full spectrum, deep red, far red, and UV. Rated at over 243 µmol/s PPF with an L90 lifetime beyond 54,000 hours, it uses Samsung white-based diodes and carries an IP56 ingress rating. Physical dimensions are 45.35 x 2.68 x 2.20 in and weight is 1.17 kg. The bar mounts at 6 inches or more above the canopy and is intended for configurable arrays rather than fixed single-fixture coverage; spacing and bar count determine footprint. It operates with a separate ThinkGrow Model One driver, with the TLD-4 enabling four-channel control and optional integration to TrolMaster controllers for spectrum and dimming automation.