The light bulb in one of my machines dimmed too, and it was really frustrating because the repair guy told me you can't replace the LED bulb in that machine. It's designed to be thrown out when the bulb dims.
So I bought a couple of those bendable lights that you attach with velcro or sticky tape, but they kept falling off, they wouldn't stay where I aimed them, and they were really quite expensive. Then I found the perfect lamp at IKEA. It has a bendable arm that stays where you put it. It comes in both a clip-on model and a weighted-base model. It was $15.00 and I liked it so much I went back and bought another one.