How bright should the teleprompter display be?
Clarity results from the brightness and contrast of the image relative to the ambient light conditions. A display that looks perfectly wonderful in a darkened room may be partially washed-out on a brightly lit stage or totally invisible in full sunlight. Brightness is typically specified as cd/m2 (candelas per square meter) or nits but this is only an indication of the panel itself and not the system as a whole, as much of the perceived brightness depends on the actual reflectance and transmission properties of the display surface. Generally, LCD displays offer more choices in brightness and contrast than other forms of display a conventional CRT has an upper limit of about 250 nits whereas an LCD can be driven to 1800 nits or more. As a rule of thumb, 450 nits are fine for most studio use, 750 nits for highly lit indoor studios, more than a 1000 nits for outdoor use, and direct sunlight will require as much as 1500 nits!
