The hotel room I’m currently staying in has terrible lighting; it’s almost impossible to read from paper. The work desk in a corner is even darker. It would be impossible to use it as a drawing surface, so I devised a little improvised desk lamp.
The app I’m using on my Nexus 10 is Galaxy Nexus Flashlight. It’s really simple and elegant, but the selling point for me was that it can be used with the screen turned off. Try it out, it’s nice.