... Lamp Quartz envelope,heat shock resistant IR Quartz Heating LampBenefits VS Features:1.Versatility of heat source: ... - 20mm4) Length: 100 - 3800mm5) Lifetime: 5,000 - 8,000hrs6) Color temperature: 1,200 - 1,500k7) Wavelength: 3 - 1,000um8) Adopts quartz ... feel free contact me if you are you any question . IR Quartz Heating Lamp