I suspect that dark is better, but whatever else certainly not worse.
When rooting plant cuttings in water, does it matter if the container is opaque or not? ( in regards to the speed of obtaining roots )
I’ve used both. Saw no difference.
Makes no difference
Good info:
I'm not a botanist, but light contains energy that is used by plants. I suspect that the cuttings would do best in some kind of light rather when cut off from light.