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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.
KoS, Public Domain, A Small Halogen Bulb in a Lamp. A Halogen light bulb is a type of incandescent bulb that looks and functions similarly to traditional incandescent light bulbs, but has several advantages over its counterparts. Halogen bulbs get their name from the type of gas that is encased within the glass bulb.