Solis Tek’s 315W 4200K is a single-ended ceramic metal halide (CMH/CDM/LEC) horticultural lamp intended for broad-spectrum use. The 4200K “4K” white output favors vegetative growth but can be used throughout a full cycle. Retail listings specify open-rated construction suitable for open fixtures, with low radiant heat and about 34,000 initial lumens. Independent retailer specs report roughly 550 µmol/s PAR output. This lamp is commonly paired with the Solis Tek C1 315W CMH fixture; retailer footprints for that system indicate an approximate 3x3 ft primary canopy area, extending to about 4x4 ft in greenhouse or supplemental applications. Designed for consistent spectral quality when driven by a compatible low-frequency CMH ballast. Note: brand-confirmed high-resolution pack imagery for this specific bulb is scarce across official retail sources.
