Florescent Bulb Question-- Better safe than Sorry

[jams]

I have a question about replacing regular incandescent bulbs with florescent bulbs.

I want to replace my incandescent bulbs with florescent bulbs to gain more light (lumen's) My fixture is rated at 60w max and I want to put in a florescent bulb that gives off the equivalent of 100 watts. The florescent bulb only uses about 23 watts of power.

I am assuming the rating on the fixture is based on power consumption and the heat that a regular incandescent bulb give off to operate safely. It probably has no bearing on the equivalent light given off????

In the end, is it safe to add a brighter florescent bulb.