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This ceramic metal halide grow lamp is designed for professional horticulture lighting applications that run on 315 watt CMH systems. The 4200K profile gives it a cooler spectral character while still targeting photosynthesis efficiency in controlled environments. Its double envelope construction and PGZX18 base support use in compatible open or enclosed fixtures. That makes this lamp a practical replacement option for facilities maintaining CMH lighting programs with a cooler output profile.