a bout television

And the effect is the illusion of scenes from elsewhere. I like to watch TV in the dark, though it does strain the eyes a bit.

The only way a white screen can produce the illusion of black is if it is displayed in darkness. A television screen lit by room light is much darker than a movie screen lit at the same level. The TV CRT glass is intentionally tinted to achieve this effect, even though it wastes some of the brightness. Having a tinted screen allows the TV to reproduce the darker parts of the image in reasonable room light. A movie screen cannot do the same, because its operation relies on reflection, not an internal light production.

If they were to increase projected light so that the bright parts of the image contracted your pupils enough that the parts of the screen, lit by normal room illumination, looked dark by comparison, they would melt the film. Remember that all the light seen by the entire audience, watching that large screen, first passed through a postage stamp sized frame of film, with a brightness rivaling the Sun.