Use energy-efficient light bulbs if you're looking to cut as much energy costs as possible. The light is dimmerable, which is handy if you want to adjust the brightness.
From Amazon
Osram 2G11 36 Watt Compact Fluorescent Light Dulux Lamp
LED Bulbs
Osram Dulux 36W PLL 2G11 Cool White - 4050300010786
Big on Electricals
Osram Dulux 36W PLL 2G11 Cool White - 4050300010786