CMH PGZX18 315W 4200K

Cultilite’s CMH PGZX18 315W 4200K is a single‑ended ceramic metal halide grow bulb for high‑frequency CMH fixtures. It uses a PGZX18 base and outputs a neutral daylight spectrum around 4220 K, suited to vegetative growth and mixed-use rooms. On the brand page the 4200 K version is rated 315 W, 3.35 A, 101.6 lm/W, 31,170 lm and 0.88 power factor, with a photosynthetic photon flux of about 535.9 µmol/s. Cultilite notes CMH lamp lifetimes up to 20,000 hours. Coverage depends on the reflector and fixture; typical 315 W CMH systems illuminate roughly 3×3 ft (≈90×90 cm). Use only with compatible 315 W CMH electronic ballasts and PGZX18 sockets. This bulb sits within Cultilite’s CMH/LEC line alongside a 3000 K alternative.