Check out this pocket light concept designed by Harc Lee. It looks pretty impressive and share the same looks of a flatten light bulb. On the unfolded position, you can actually stuffed it into your wallet conveniently, while it can be a good light source when you fold the bulb up.
Sharing the blissful moments with your beloved.
In unexpected situations even a little lamp can be moving.
Just a card from your wallet sends out beautiful, mellow light,
with a cell at its back providing power.
The use of Back Light Unit makes its brighter even.
— by Harc Lee
More Detail: @Harc Lee