If the output is 60 I imagine it is using about 23watts of light to power it or whatever it says on the box. You are getting 23 watts per bulb.
If you don't know this already, walmart has lights of america brand CF bulbs in the perfect kelvin range 6500k using about 23 watts per bulb. $9 for 2. Works great with those clip ons lamps or replacing incandescent bulbs.
The extra light does help.