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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.
In fact, halogen is just a hybrid incandescent. Both types of light bulbs use a tungsten filament. Both âburn outâ when the filament breaks. Both use line and low voltage the same way. Also, both incandescent and halogen bulbs can be dimmed.