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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.
Tungsten incandescent, most common in household lamps, has a slightly lower color temperature at 2900Â°K than tungsten-halogen (aka quartz) at 3200Â°K, so its output will be slightly warmer. Incandescant lamps also shift their color, growing warmer as they age, something tungsten-halogen lamps don't suffer from.ungsten incandescent, most common in household lamps, has a slightly lower color temperature at 2900Â°K than tungsten-halogen (aka quartz) at 3200Â°K, so its output will be slightly warmer. Incandescant lamps also shift their color, growing warmer as they age, something tungsten-halogen lamps don't suffer from.