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Ruby Quartz Heating Tube Insdustrial. Ruby quartz tubes boost short-wave infrared heat output, block glare & UV rays, energy-saving and customizable for safe heating. Ordinary tubes release dazzling UV light hurting eyes; ruby coating filters harmful rays without losing heating power. 95% infrared transmittance, 90% glare blocked, long service life with stable high thermal efficiency. Ideal for oven drying, sauna and industrial heaters, it saves electricity and shields staff from harsh strong light. Compared with clear quartz tubes, ruby ones block UV and save more energy with mild soft light.