I have those like 1charmshort shows in her post. Amazon sells a lot of those kind. I can't remember the brand I bought but they have been working on 2 of my machine for at least 5 years and still going strong. Mine are plug in not the USB type if that matters.
I also have a large Ott light that shines over the front area of my machine. AND my machine is in front of a window so I get LOTS of light from all over.