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Rosco CTB Blue overview. Roscoe Full Blue CTB Color Conversion Gel Filter - This filter is traditionally used to convert tungsten lighting to daylight. CTB (Color Temperature Blue) filters are available in a full spectrum of degrees (strengths) which, depending on your needs, can be used to either raise the temperature of your lighting or to create different lighting interpretations. CTB filters offer you complete control when shooting under tungsten lighting.
Halogen light bulbs look and function much in the same way as incandescent light bulbs. They feature a glass bulb that contains an oxygen free environment. A tungsten filament is mounted in the center and the whole bulb is attached to a metal base that screws into a light fixture.