Oh, IKEA. You never cease to amaze me with your clever ways. Meet the SUNNAN Light - a handsome little fellow free of wires and powered by the sun! With a full charge (9-12 hours of sunlight), this desk lamp will put out 400 to 500 lux at its starting point. After 3 to 4 hours, the light intensity will decrease to about 300 lux. Uses LED bulbs.
SUNNAN Light from IKEA: $20

Please excuse me while I pay some bills...