The CMH fixture can be used as a primary veg light, a primary light for SOG applications, or a supplemental full spectrum light for large flowering operations. Fully sealed, low frequency ballast is side mounted. The CMH 315 single lamp fixtures vertical lamp mounting position provides an even light footprint. Meets ETL Standards and uses 97% German reflective material. Both Nanolux CMH fixtures can be used with any 315W 3K or 4K horticultural lamp from all the leading quality brands.