I use the same light/magnifier that Joni shows from Orvis. Thankfully, it can be purchased for as much as 25 bucks less than the Orvis number, exactly the same unit, though (basspro has it for 105). Its great, but as she notes, wicked heavy base to travel with. I wouldn't tie on a daily basis without it. Hell, I couldn't tie without it.
To that end (travel kit) I bought a Carson Magnifly, probably on fleabay( or amazon: