Constant VERY_LARGE_CINEMA_LIGHT 

pub const VERY_LARGE_CINEMA_LIGHT: f32 = 1_000_000.0; // 1.0E+6f32

1,000,000 lumens is a very large “cinema light” capable of registering brightly at Bevy’s default “very overcast day” exposure level. For “indoor lighting” with a lower exposure, this would be way too bright.