Retrieved from https://www.biology-online.org/dictionary/index.php?title=Inhibition&oldid=10287
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.
Lumens are a useful metric for comparing how bright a light source is (i.e. a 60W incandescent bulb is about 850 lumens â see Electric Light Sources for more about lighting efficiency). The human eye perceives light within the âvisible spectrumâ â between wavelengths of about 390 nm (violet) and 700 nm (red).