LEAF5 THOR MAX 800W is a low-footprint, IP65 greenhouse LED top light designed to replace legacy HPS/CMH fixtures. It uses a single adjustable channel and glass-lensed LEDs to improve penetration and resist water ingress. The external driver supports 0–10 V dimming on 120–277 Vac for stable operation and easier heat management. The official datasheet rates system efficacy at 2.6–2.7 µmol/J with a PPF output of 2160 µmol/s. At 45 cm above canopy, the 800 W unit averages about 889 µmol/m²/s PPFD; the 400 W companion model averages 476 µmol/m²/s over a 1.2 × 1.2 m test area. The 800 W THOR MAX measures 66.4 × 26 × 7.9 cm, weighs approximately 8.9 kg, and integrates with LEAF5’s HydraOS control ecosystem.