... of filament.Especially, in the case of red-coated far infrared lamp, the red-coloredcoating prevents the inner heat from being ... of filament.Especially, in the case of red-coated far infrared lamp, the red-coloredcoating prevents the inner heat from being ... .It has various kinds of types: IR125R40/RED, IR150R40/RED,IR250R40/RED,IR275R40/RED, IR375R40/RED etc.It has various kinds of wattages and ...