Photontek’s 680W GH Top Light LED (Red + Blue) is a compact greenhouse top-light engineered as a 1:1 HPS replacement. The fixture draws 680 W and delivers up to 3.4 µmol/J with a total PPF output of 2285 µmol/s. It uses Osram and Seoul Z Power diodes and operates on 277–440 V AC with passive thermal management. The linear housing measures 25.7 x 10 x 4.6 in and weighs 19.4 lb, with a 100–120° beam angle to promote uniform canopy distribution. Control options include onboard dimming and 0–10 V external control compatible with Photontek or universal controllers; daisy-chain networking is supported. The unit is IP65 rated, CSA/FCC/IC certified, and rated L90 > 50,000 hours. Supplied with hanging set and power cables.