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Some dynamo lights have an auto function which switches them on when it gets dark. You could just fix the switch in that position:
https://roadcyclinguk.com/gear/busch-and-muller-iq-fly-senso-plus-light-tested.html
Just to add, cycling is awesome for dementia as it maintains fitness and independence. I worked briefly with someone who built a system with a static cycle linked to a projector and google maps so that people with dementia in care homes could explore areas that were familiar to them "by bike".
Wasn’t sure where to put this but thought misc would get the most traction.
My Dad has Alzheimer’s but loves riding his bike. He doesn’t think anything of riding his bike at night and doesn’t have any lights, nor would he remember to turn the lights on if he had any.
Are there any lighting solutions that are permanently on regardless? Or something that will be reflective to cars so can be seen without him having to turn anything on?