I use a little light I bought at Walmart for about $8. It converts 120-V power to something like 12 VDC and has an extendable, adjustable goose-neck, concave tilting head, etc. Good little product. Probably Chinese, which is irritating, but what small electric isn’t these days?
I’ve never understood the appeal of the “true color” lights you pay so much for (bulbs are worse yet) just to tie flies. The materials invariably come from a fly shop where it’s too dark to tell the real colors you’re buying. Plus, that color changes when you drop it in water. So at the bench we need to see the “true color”?