I've had some experience with Ott lights - bought a big one half price at Joanne's years ago. (Still spent almost $90!!) It worked for just over a year - then one day, it just quit! I tried replacing the bulb, tried replacing the electrical part on the cord - nothing. I wouldn't buy another one.
There are lights that do the exact same thing MUCH cheaper elsewhere. I got one at Big Lots for $19.99 or $29.99 a few months ago, and it's great for sewing on black fabric with black thread!! JMHO, but find a cheaper one than OTT.