The SZHLUX SZ-PT400 is a 400 W full‑spectrum LED grow light with a double‑switch layout to run part or all of the array. It uses 864 SanAn 1 W LEDs to provide white light blended with 660 nm red and 730 nm infrared for use from seedling through bloom. The passively cooled aluminum housing measures about 23.6 x 23.6 x 3.3 inches and weighs roughly 10 lb. Intended canopy coverage is approximately 4 x 4 ft. Listings describe a fanless design and on‑fixture switching rather than a continuous dimmer, with an estimated service life up to 50,000 hours. This model targets indoor and greenhouse growing where simple, on‑fixture control and a 4 x 4 ft footprint are desired without external controllers.
