ThinkGrow’s Model One DR‑1 is a 4‑foot modular LED grow light bar designed for the Model One system. The DR‑1 integrates two spectrum channels—full spectrum white and deep red—allowing spectrum balance via the onboard dimming knob or with compatible TrolMaster controllers. It draws 90 W and outputs more than 243 µmol/s PPF. The aluminum bar measures 45.35 x 2.68 x 2.20 inches and weighs 1.17 kg, with an IP56 rating and L90 lifetime beyond 54,000 hours. Samsung white‑based diodes deliver the primary spectrum, while the deep‑red channel targets flowering support. The bar mounts at least 6 inches above the canopy and requires a separate Model One driver (e.g., TLD‑2). Coverage depends on bar count and spacing within the modular configuration.