Yes, the trend to brighter lighting and lighter-coloured wall coverings is driven by both of those factors, and especially the first of them. The PRM NTSN (GB domestic equivalent of the TSI) requires specific minimum lighting intensities, for a start. I'd love to know exactly what they are, but not enough that I'm willing to pay for a copy of the ISO standard to which the NTSN points.I have always assumed the trend toward super bright super white lighting in both trains and buses was about accessibility and safety.
Safety is important too, as Bletchleyite noted when he said that one person's cozy is another's dingy. I still believe that there's likely wiggle room in how the lighting is configured, and in the colour temperature chosen, but at that point we're back in the "little attention to detail" area in which British railways sadly like to spend so much time.
Truth be told, I think it's probably the case that the forum's membership includes a significantly larger number of people with sensory disorders than you would find a group of the same size randomly selected from the general public. It's one of the many areas in which we shouldn't assume to be a representative sample.Somewhat bothered by all public lighting, really, given I have almost no sensory input filters. I spend all my time on a train looking out the window though, so as long as it doesn't flicker ( begone luminescent tubes ) & isn't obnoxiously bright it's not a huge deal.
(and I say this as a person with such a disorder myself)