I have a big older style light box that takes up to A3 size. I wanted to trace some small patterns today, which started me thinking about a new light pad. Then I wondered if there was an app for iPad. And guess what, there is! (Light table for iPad).
Since my iPad goes almost everywhere I do, I'll always have a light box with me now. It's not quite as bright as the light box but certainly works for smaller projects. It was easy to slip between pages too.
Hope you're having a great week.