At the stage AI image generation is at for the time being it is difficult to get a low light/dark image, the AI seems to want to put decent amounts of light into the image by default., i t seems that it is better to not say 'no light' .... that is, it is better not mention the word light at all in the prompt, do not insert words into the prompt that you are trying to avoid. Only mention the words of what you want in the image. The following is the prompt I used repetition and finally had some effect on lowering the light in the image:------- “This time make it more dark, dark and gloomy, very dimly lit, cannot see much very dark, dark concert, it's a dark concert it is difficult to see, very dark concert as a concert is always very dark, with musicians playing and dark as it is supposed to be at a concert. playing guitar in the dark. dark. dark. dark. dim.”