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Ruby Quartz Heating Tube Clean Radiation 1700W Circuit Board Curing Factory. This heating tube requires no extra ballast or complex control circuits, which simplifies equipment installation and lowers overall manufacturing maintenance costs. Ruby quartz heating tubes feature low thermal expansion coefficient so they can resist water splashes and accidental bumps without easy breakage in workshops. The soft red glow reduces eye fatigue for workshop staff and creates a much more comfortable working environment than transparent quartz heating lamps.