When filming, how to use lights to simulate real light sources?

This question is a little general. Strictly speaking, when shooting a movie, as long as it is shot in non-natural light, as long as lighting is used, it is simulating the real light source. But this is divided into two situations: one is the hypothetical light source that does not exist in the simulation picture, such as sunlight, moonlight, cloudy sky light, and street lamps, car lights, neon lights and other light sources that cannot be seen in the picture, but we assume that they exist; The other is to simulate the real prop light sources in the movie scene, such as desk lamps, floor lamps, chandeliers, candlelight, computer TV screens and so on. I think the questions asked by the subject should mainly belong to the latter situation. Although it is a simulation, this kind of simulation behavior is handled by different films and different cinematographers, and the grasp of discretion is different, which cannot be generalized. This difference in discretion is mainly caused by the difference in film style and the work habits of cinematographers and lighting engineers. If it is a realistic film, light and shadow all pursue the realism of documentary style, then when dealing with it, we will try our best to restore reality. Take candlelight as an example. The characteristics of candlelight fire are low color temperature, about 2k, and the color looks red. There will be flickering and swaying in the burning process. As long as you simulate these characteristics, you can basically simulate candlelight. In the past, when shooting film, the film sensitivity was not as good as that of the current digital camera, so some photographers, in pursuit of realism, lit more candles outside the painting at the same angle as the prop candlelight. For example, there is a candle in the picture, and according to the required light hole, ten or twenty candles with bold light cores or other fire lights may be placed outside the painting for illumination, so as to restore the reality to the maximum extent. Of course, you can also use tungsten lamp with appropriate power, put it at the same angle, add color paper that can reduce the color temperature to about 2k in front of the lamp to simulate the color of candlelight, and then artificially create irregular flicker by changing the value of the voltage regulator or shaking it in front of the lamp, so as to simulate it as much as possible. Nowadays, digital cameras are used to shoot, and the sensitivity has been greatly improved compared with film. Photographers can use fewer candles or use relatively low-power lamps to simulate. Similarly, to simulate the light source of computer TV screen, we can also produce real and sufficient illumination by brightening the screen brightness, shortening the distance between the screen and the actors, and increasing the number of screens. We can also use soft light lamps such as LED and Kinoflo to simulate it.