How can I shoot better photos in very low, single-color lighting?

Question

I often photograph events where the light is both dim and strongly colored, such as red or blue party lighting outdoors. In these situations my color images usually look poor, and black-and-white conversions can end up flat or strange.

My current approach is to raise ISO until I can keep the shutter speed I need, shoot wide open, and sometimes convert to black and white. I usually avoid flash, but I’m open to using it. Are there any best practices for exposure, white balance, black-and-white processing, or lighting when working in very low monochromatic light?

user75526 · Answer

As you've already identified, the problem is likely associated with low light levels.

Monochromatic light exacerbates the issue because only 1/4 of the sensels are used for pure red or blue light, and 1/2 of the sensels for pure green light.
Consider adding on-camera flash with a diffuser or bounce. Though many recommend against it, it is warranted in this case because it makes the difference between getting a viable shot or not.
When post processing to black and white, evaluate each of the channels to select the best ones. For instance, if shooting in pure red light, the red channel will likely be the best. It would make no sense to mix in any of the blue or green.
Pushing ISO does not only increase grain. It also reduces dynamic range and color fidelity. If you like the look of grain, add it in post (or enable grain enhancement if available on your camera).

How can I shoot better photos in very low, single-color lighting?

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