Can anyone recommend a battery-operated light for a music stand?

The room my windband rehearses in has changed its lighting system and where I'm sitting there is not enough light for me to see clearly. I have complained to the conductor but he said there is nothing he can do about it and thought I ought to be able to see well enough anyway because he could. As I have got older I find that I am far less tolerant of dim lighting and by the end of the last two rehearsals I have had a headache.

I've used a Mighty Bright clip on light before when outside Christmas caroling. They seem to be in most music shops, including online ones.