XRB1,XRB3 of insulating glass has the cyan slightly,approaches colorless glass,XRB1 is phosphate absorption glass,XRB3 is silicate absorption glass. They are not the main absorption visible ray, but is the absorption the thermal near-infrared light which is largeness, every needs the candle-power to be high but also needs to separate thermal the situation all to be possible to apply. Be applied in products of cold-light sources, such as cold-light lamps in the operating room, slide and overhead projectors.