Listed for suspended, totally exposed (outdoor), high-bay (indoor) comfort heating and exterior snow & ice control applications. • Listed for recessed applications. • 20 Gauge painted steel or stainless steel housings. • Gold anodized Aluminum reflectors & end caps. • 50% higher Watt densities for 3-element units. • 2-Lamp wiring, single phase. • 3-Lamp wiring, three or single phase. • Stainless steel models have non-corrosive housing, hardware and brackets; no ferrous metals used in the unit. Durable in harsh atmospheres & outdoor environments. • High temperature lead wires. • Clear Quartz Lamp(s) Included.