Gday float and room, I have to use dark because I have more than a colour defect to colour blindness, bright coloured indicators stand out more on dark backgrounds, curious colours for a guy like pinks and purples but they are ones that work for me, I'm terrible with greens/greys/browns and orange/greens, especially on a white background opposed to dark, decades ago I recall the coloured dots were done on a white background to register colour defect or blindness.
