There are tips available on web, if we switch of the un-wanted lights, it will be great help for our bill as well as environment.
Can you do this from now onwards?
http://www.moneysavemoney.com/
Printing Costs: Does Font Choice Make a Difference?
http://blog.printer.com/2009/04/printing-costs-does-font-choice-make-a-difference/
Save printing cost by changing the font
http://www.moneysavemoney.com/publish/moneysavingtips/Save_printing_cost_by_changing_the_font.shtml