Pro-emit’s DIY-M-KIT COB SMD 300W is a hybrid, build‑it‑yourself grow light that upgrades the classic 200W COB kit to 300W by combining four 50W Cree CXB3590 COBs at 3500K with two 50W SMD add‑on boards. The add‑on boards use Samsung LM301B (5000K) LEDs plus Osram 660 nm Hyper Red and 730 nm Far Red emitters to extend the full spectrum. The kit is passively cooled and supports internal or external dimming depending on driver choice. Recommended coverage is up to 100 × 100 cm, with average PPFD listed at 812 µmol/m²/s in brand materials. Introduced in 2020, Pro-emit positions this configuration as a balanced mix of COB punch and SMD spectrum control for rectangular areas.
