I don't have a lit reader now, and I do OK using lights in the room. It helps that I live alone so I can use whatever lights I want
I can remember only one occasion when I was reading in a rather dimly lit place and wished I'd thought to bring a clip-on light.
My reader is only a year old and still working fine, so I don't have plans to replace it in the near future. I suppose by the time it dies and I buy a new one, they'll all have lights built in.